See the MS3 manual wiring diagram for how to wire it up. MS3base/V3. My tach was originally driven from the Neg side of a single 12V coil. The wiring harness connector is sold separately as we give you a choice of a ready-to-crimp connector, or a pre-crimped pigtail. 8′ of TXL High temp automotive grade wire. 0 and higher code; some earlier codes used different wiring. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. Pick the ONE manual that applies to your ECU. 2 digital outputs. What sort of serial cable does it use? It uses the same DB9 to 2. MegaSquirt MS3X Wiring Bundle - Length = 8' 8' of TXL High temp automotive grade wire. This confuses me. You may have to register before you can post: click the register link above to proceed. Regular price2. General Tech Forums. I am hoping to test fire my car this week. Pin 9 - Green / White. Customer reviews. The crank sensor shield is also listed as Pin #2, but that just seems to be another ground wire on my harness that was routed out towards the sensors. 8′ of TXL High temp automotive grade wire. We've got a pre-assembled MS3 with the MS3X extra board, and I believe it is a V3. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . Wire to pin 8 for 1G and 2G MS3X connector: pins 2, 3, 8, 12, 17 Wire with your grounds from the mainboard pin 4 Injector F output (cyl 6) Wire to pin 16 for 1G and 2GRe: MS3+MS3X and the EEC-IV adapter board Post by xrattiracer » Sun Mar 28, 2010 5:50 am what exactly would be the point of using a ms3x with the stock ford harness? you would have to add all sorts of extra wires for the extra functions anyway. Long TXL High-temp Wire, Heavy-duty DB37 Metal Hood, RFI/EMI Shielding, for use with MS3X Expansion Board, Each See More Specifications. For many first-time users, it may be tempting to re-use old connectors and wiring. Joined: Mon Sep 19, 2011 6:10 pm. 4g63 with stock 1990 sensor. 5″ long (including the mounting ears), 4-5/8″ wide, and 2. I have an m52 b28 in my car, running the obd2 harness spliced to my MS3x harnesses. I even pulled the Ms out and made sure the jumper was installed for the cam input. AI-enhanced title. 0. 5. Both composite and tooth loggers completely lack input from the crank sensor. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . Hardware manual covering specific wiring and configuration of your Megaquirt MS2/V357 ECU. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. 5 mm barrel connector used with the Innovate LC-1 and VVTuner. Engine Management Systems. . MS3X/V3. I have recently purchased the ms3x 3. 2. 3. I'm less clear on whether its important to run the ground from MS to the engine (and thus back to the battery) or if I can simply take them to the battery via a nearby distribution block. 5″ high. 0 Hardware Guide 2. 99 DIYAutoTune MegaSquirt MS3X Wiring Harnesses Wiring Harness, MegaSquirt MS3X , 8 ft. 8′ MegaSquirt Wiring Harness for MS3X. That’s it! Using the MS-I PCBv3 or V3. 6 > 88 Carrera wiring queries. pin 21 CLT signal. Ok. At least that's what the wiring diagram that came with it says. This model is equipped for basic, batch fire, but can be expanded to add sequential injection and 8 channel ignition control with an MS3X card (sold separately). MegaSquirt MS3X Wiring Harness - 8 feet 8' of TXL High temp automotive grade wire. Use with MS3X Expansion board or other sequential device Just like a short run of the MS3X harness, but with no DB37 connector. 5 out of 5 $ 114. 99. Hardware manual covering specific wiring and configuration of your Megaquirt MS3X/V30 ECU. SAYS IF HALL SENSOR. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. Wiring ms3x megasquirt ms3Ms3 pro ultimate wiring diagram Ms3pro a/c control wiringMegasquirt ms3x wiring diagram. 99 JimStim-C: Assembled JimStim diagnostic board $17. Boscobel, WI 53805. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! Use with MS3X Expansion board or other sequential device Just. 99. Would 18 gauge be alright to run from the MS. The heart of the beast! A turbocharged 2JZ dancing to the tune of an MS3X ECU. External Ignition Wiring. Yeah, you need to test each coil in test mode to make sure they're even wired up correctly. 00 MS3X357-C_BL: Assembled Megasquirt-III V3. I bought a de-pin tool so I can repin my DIY harness and have done it exactly as shown in the first diagram (ms3x) - with each sensor getting a ground wire. Tweet. 25 IATwPiggy: Intake Air Temperature Sensor $9. - MS3 V3. Since my MS3X is already installed and running my 1997 Vortec 350ci Truck, all I have to do is splice into the factory wiring for the signal hopefully this will. 2a. 2. DIYAutoTune Wiring Harnesses MS3X-Hrn. Would 18 gauge be alright to run from the MS. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. 57 mainboard with MS3X as shown above running firmware MS3 1. 99. That is the one part of the harness I did cut, and rewired the IAT wire to the GM sensor I installed in the y-pipe. 0 Hardware Guide 1:Introduction The MS3X/V3. -. 24″ of TXL High temp automotive grade wire. 99. I feel that one of the common colour schemes should be used, e. ( 8 customer reviews) $ 1,749. Re: Megasquirt ON BMW m52 Engine. Top. Serving my area. MegaSquirt MS3X Wiring Bundle – Length = 8′. From that same relay area, run a 12 gauge red wire all the way back to the ECU. Today's Posts; Member List; Calendar; Forum; E30 Classified Forums; For Sale & Wanted; Parts For Sale; If this is your first visit, be sure to check out the FAQ by clicking the link above. Color coded wiring with labeling printed on the wire every 6 inches — no paper tags here! All wiring is pre-crimped (NOT solder cupped!) to the DB37 Heavy duty metal DB37 hood for superior RFI/EMI shielding (no cheap plastic ‘metalized’One 12V, one ground, one crank sensor and one cam sensor. Now to remove the grommet you'll need to use a flat head screw driver from the engine bay and pop it out. This article does not apply to LM1815 circuits, such as the Zeal daughter board. I'm running shielded CAM sensor wiring though. 00. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. Sequential Fuel and spark plus a WHOLE LOT more! Professionally engineered and easy to install, fire up your L-series engine on day one! All wiring is composed of, self-extinguishing wrapped hi-temp TXL automotive grade wire with OEM connectors. I'm trying to avoid having a couple of fine wires needing to jump across from the MS3x harness to the MS3 harness. 57 mainboard as it uses the same driver as the MS3X. 1 Wire and connector choice. Re: Megasquirt ON BMW m52 Engine. With my coils and injectors just an inch from the cam-wiring, its better to be safe than sorry. This version of the documentation applies to: • MS2 on a V3. 1-8 Spark 1-8 Cam Nitrous 1 (Line Lock) Nitrous 2 (Trans Brake) Boost (Boost Solenoid) EXT_Map (LS9 Map Sensor). it's POSSIBLE the PO set it up in wasted spark (basically 1 wire will trigger cyl 1 and 4, the other 3 and 2) but that isn't likely if he's bought the harness from DIYPNP and I believe it has provisions for full sequential spark. This 8′ wire with pre-crimped terminal can be poked into our MegaSquirt DB37 harness if an extra wire is needed for additional I/O (MSHarness12, available separately). but also more difficult because there are way more wires and sensors in the engine wiring harness to connect to, especially the US. ) 5. I am using a preassembled ms3x system with a 3. consider it time to get rid of that ratty old stock harness and do up a new one. Pins 19 through 14 should remain bundled on an adequately sized ground wire to the engine block. Our USA-assembled map sensor uses a universal keying that is compatible with pigtails for 1, 2, and 3 bar MAP sensors. Customer leaves one star review because he expected the wire bundle to be 30" long. $114. 0 – Unassembled Kit Part # MS330-K. PWM IAC Wiring: To wire this up without the relay board (directly to the ECU), wire up the hot wire from the idle valve to switched 12v+ (hot in RUN), and wire the negative wire from the idle valve (stock EEC pin 21) directly to pin 9 on the MS3X DB37. harness side) when showing db37 pinout at all times. That puts the ground for both sensors going to the main board pin 1. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. There is a recall on us crankps and they sell a wiring harness kit with it. Color coded wiring with labeling printed on the wire every. Alot of time the shield wire of the crank wiring is left untouched, but it needs to be grounded. Length Harnesses, Kit See More Specifications | Check the Fit Estimated Ship Date: Oct 31, 2023 Would you rather pick it up? Select Location Drop Ship Special Order Add To Cart Beat A Price Guarantee Wish List Compare Summit Racing Equipment SpeedCard A. Would 18 gauge be alright to run from the MS. Note that the DIY Autotune wiring harness has a shielded wire – connect only the inner wire to this pin! Connect the E pin to MS3X pin 14 to send the timing signal to the HEI module. Run this resistor-on-a-wire from the 5 volt terminal in the proto area to the same input pin (SPR1 or PAD7) used in the previous step. 0 too, but the point gurov makes is fair - using identical drivers for both sides is good practice. Find DIYAutoTune MegaSquirt MS3X Wiring Harnesses and get Free Shipping on Orders Over $109 at Summit Racing! DIYAutoTune MegaSquirt MS3X. Megasquirt-3 Setting Up manual PDF WWW. Megasquirt diagram wiring ms3x ms3 computer honda efi engine wire fuel source iq installation injection [diagram] megasquirt relay board diagram20 beautiful megasquirt wiring diagram Megasquirt relay board harness did own adRelay board mod: 2-wire pwm air valve + electric fan relay. On the diagram, it shows only one wire coming for the harness, I assume the other wire will be the keyed positive. And when grounding them to the Megasquirt when. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. . I used a short ignition cable to be able to use the timing light. I'm less clear on whether its important to run the ground from MS to the engine (and thus back to the battery) or if I can simply take them to the battery via a nearby distribution block. 6 conversion. New MS3X wiring products available Post by Matt Cramer » Wed Oct 06, 2010 10:12 pm In addition to our new MS3X harness , we've used our new harness-building equipment to come up with three other MS3X related wiring items:Ms3x sync loss problemsWiring diagram megasquirt sensor ms2 ms3 crank position harness diyautotune fc db37 ms1 switch work signal rpm problem thumbnail fuel Pro ms3 wiring diagram ultimate ms3pro megasquirt enclosure resistant developed provide gen 1st cart details addMegasquirt wiring 2gn ms3 ms3x. Would 18 gauge be alright to run from the MS. 99. B1 - ECU Ignition Switch:. All you are doing is connecting the OEM plugs to the FlowForce harness. 0 ECU for. Top. Add to wishlist. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! All wiring is pre-crimped (NOT solder cupped!) to the DB37 Heavy d. Click here to download the standard MS3Pro documentation. Wire the distributor’s VR sensor to the HEI module VR inputs. GeorgePatches wrote: I actually found the answer on the megamanual website for the MS2. . billr wrote: If it will fire while cranking, then die as soon as the key is released back to the "run" position, it seems like your primary problem is how the ignition switch is wired to provide power; probably has nothing to do with the tune. 57 and both complete wiring harnesses already wired for a coil on plug 3rz-fe motor. 1. Boscobel, WI 53805. Help with traction control wiring and needs. Get Connected. Description. Connect it to pin 24 on the Megasquirt, or the Tach pin on the relay board. To make sure you can’t accidentally switch the upper and lower harnesses, the MS3X harness uses a male DB37 connector instead of a female one. 8′ MegaSquirt Wiring Harness for MS3X. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. MegaSquirt MS3X Wiring Harness - 8 feet 8' of TXL High temp automotive grade wire. Connector Gender: Male. Last. This terminal is also grounded to the engine block. 5 4. 2a. Full sequential COP and injection. 3 high current digital/pwm outputs. ) Does not apply to other Megasquirt products or other firmware versions. Get a Quote. ( 4 customer reviews) $ 114. 6 engine with ITBs, COPs, MS3X 2021 Macan S Day job. General Tech Forums. 99. The wiring is tremendously more complicated than MS1/MS2 with the addition of cam sensing and sequential ignition/injection not to mention all of the additional input/output ports. the Foxbody 550-937F kit is $1230 and i think the difference is connectors, but my connectors are not all the same anyway. Color coded wiring with. by Dennis930 » Fri Jul 30, 2010 1:56 am. I like using the relay boards because they simplify the wiring process and they make it a lot easier to have a clean install. With the jimstim hooked up it still says "not rpm synced". 3) MS3 Cam Input (Dual VR v2. MegaSquirt 3 Engine Management System w/PCB3. MS3X N/A Overdrive solenoid valve Unit A - cyl 1,2; Unit B - cyl 3,4; Unit C - cyl 5,6 Mitsubishi specific notes apply to 1997 5-speed ECM and wiring harness' Fuel Injection, ignition (Eng GND) 130 129 N/A N/A Fluid temperature sensor Low-reverse solenoid valve 124 confirm in manualMegasquirt ms3x wiring diagram. Engine Management Systems. Includes complete Universal 8′ Flying Lead Harness. Color coded wiring with labeling printed on the wire every 6 inches — no paper tags here! Use with MS3X Expansion board or other sequential device. Collect the sensor grounds at the engine together onto one line and run that to Pin 7. We’ve packaged a DB37 male solder cup connector and a metalized plastic backshell for your MS3X builds. SAYS IF HALL SENSOR. This manual covers MS3X/V3. 3) MS3 Cam Input (Dual VR v2. - I assume that the signal from the Vortec distributor goes to the nr 32 wire of the ms3X harness which says that this is for the cam Hall sensor. 3. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! External Ignition Wiring. Description. 180-0715 Wiring Harness - Direct Fit, Sold individually. ) How small or large this is depends on the current flowing and the resistance of the ground wires. 0 Hardware Guide 2. 4 tacoma 2rz-fe 2wd with manual using stock harness with a MS3X. I purchased the pre-assembled MS3 with MS3X board and the 24" harness for both and pretty much have it all figured out except for these options. 12′ MegaSquirt Wiring Harness (MS1 / MS2 Ready) and possibly the MS3X Harness as well if you’re running the MS3X board. Find Parts and Accessories ms3x KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Get Off-Road With Savings on Select Jeep® Products! Vehicle/Engine Search Vehicle/Engine Search Make/Model SearchI've personally found PWM valves a little easier to configure - you just need to set the frequency (Ford runs theirs at 300 Hz) and adjust the duty cycle until you hit your desired RPM. See t. 2. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. Last edited by maxott1; 12-30-2011 at 04:40 PM. it is already tuned for boost and you can literally just plug in the harness, fire it up. . x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. Also using a jimstim 2. NB2 cars have the most straight forward installation. Filter (0 active) Filter by. 57 specific External pull up: Wire a 1K resistor in between pins 24 and 26 in the main board wiring harness. Back then I installed the TIP122 as described in the manual page 44-45. - Full custom harness builds - DIY wiring solutions - Circle track harnesses - Standalone installs. 57 $ 659. 3. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. SymTech Labs makes this harness using only the highest quality TXL grade, 20 gauge wire. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. It will start with it un plugged and even cut the MS3x wire going into the harness for cam in and it still shows a tooth logger pattern when it starts up. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. 2. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. Colors shown are for factory wiring harnesses. 00. SAYS IF HALL SENSOR. This uses the PWM idle driver on the MS3X board. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. VVTuner 18″ Pigtail Wiring Harness $ 34. C1, and B1 body harness connectors to get power and the auxiliaries working. MS3x Wiring Questions. 3 Wiring Harness The Megasquirt can be supplied with a "pigtail" wiring harness to form the basis of your own wiring. 57 assembled kit, both harnesses,elec boost controller,iac adaptor . 3) MS3 Cam Input (Dual VR v2. sjpgoalie. 0 engine in my 1988 Mustang that had a 4 cylinder previously. 12 channels sequential fuel (hi-z injectors or low-z with. 0 or V3. Heavy duty metal DB37 hood for superior RFI/EMI shielding (no cheap plastic ‘metalized’ hoods. Find DIYAutoTune MegaSquirt MS3X Wiring Harnesses and get Free Shipping on Orders Over $109 at Summit Racing! DIYAutoTune MegaSquirt MS3X wiring harnesses are 8 feet of TXL high-temp automotive grade wire. SAYS IF HALL SENSOR. Re: car wont start with new ms3x. 05-19-2017, 03:45 PM. Regular price $2,099. Use this high quality MS3X wiring harness to take advantage of all the great features on the MS3X expansion board. on the main ms3 harness there is only 1 crank input wire which I do have connected to the correct pin , everything is going to the correct pinouts according to the diagram. 3 Wiring Harness; 2. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . (Speed Density only. the universal Terminator X 550-937 kit is like $1070. 99. This harness connects to the lower (main board) connector, while the upper (MS3X) connector uses the MS3X harness. MegaSquirt MS3X Wiring Harness - 8 feet 8' of TXL High temp automotive grade wire. I have the m50 cam position sensor installed as form my understanding this is the one megasquirt can read, and I have an m44 crank sensor installed. Re: MS3 wiring harness colours - standardisation. braineackMegaSquirt MS3X Wiring Harness – 8 feet. 3) MS3 Cam Input (Dual VR v2. They all go to the ground pins on the DB37 which all connect to the ground plane of the PCB. Today's Posts; Member List; Calendar; Forum; Saturn Related Forums; Saturn Performance; Tuning / Fuel Management; If this is your first visit, be sure to check out the FAQ by clicking the link above. The R pin is the HEI module’s tach output. Post by shiftin04 » Thu Jul 08, 2021 3:06 pm. Long TXL High-temp Wire, Heavy-duty DB37 Metal Hood, RFI/EMI Shielding, for use with MS3X Expansion Board, Each Location: Sandefjord, Norway. On to all the injectors. Install the firmware if. Megasquirt-3 with MS3X. 49 38NPT-Bung_A: Aluminum bung for. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here!All wiring is pre-crimped (NOT solder cupped!) to the DB37Heavy duty metal DB37 hood for superior RFI/EMI shielding (no cheap plastic ‘metalized’ hoods used on our. Look up crankposition sensor recall m52. MegaSquirt MS3X Wiring Bundle – Length = 8′. 4. MS3X/V3. 8′ MegaSquirt Wiring Harness for MS3X. Because of this, we need to replace the unshielded wire with two conductor shielded. MegaSquirt MS3X Wiring Bundle – Length = 23″. I will be using pin#32 on the MS3x harness for the Cam signal input, do I need to add the resistor and switch the jumpers of these on the MS3 board, or is that all taken care of on the MS3x board because I have and will be using that?. Would 18 gauge be alright to run from the MS. All that looks good, so I’m going to get a new sensor tomorrow. MegaSquirt MS3X Wiring Pigtail – Length = 24" 24″ of TXL High temp. 99. And we offer volume discounts if you’re making a production run. From the factory it had the sensor mounted to the timing cover. I'm setting up my wiring for my Dodge Van with 5. MS3X + 4 bar mapsensor + harness. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . MS3 units with MS3Xpander will need a second wiring harness; we carry a ready made one priced at $86. Connect the second shorter OEM 3-way connector to the matching LS coil connector with two brown wires. x (See the Setting Up manual for more detail on version numbers. Then check out our full line of MegaSquirt 2, MegaSquirt 3 and MicroSquirt assembled systems that allow you to skip the self-assembly steps that are required with our standard MS kits. 8′ of TXL High temp automotive grade wire. 3. When I planned my harness I put in a few +12V circuits for supplying things like IAC, sensors, injectors, etc. Top. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. 24″ MegaSquirt Pigtail MS3X Harness $ 79. Wire gauge on the ms3 pro harness. 3. 6 engine going into my '88 Carrera and I have a few queries that I haven’t been able to figure out. There is a recall on us crankps and they sell a wiring harness kit with it. SAYS IF HALL SENSOR. 5″ high. 4. These manuals contain wiring, fuel and ignition setup and board assembly details that are specific to your exact ECU version. Internal pull up on a V3. 57 in car for the first time and am running diagnostics. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! All wiring is pre-crimped (NOT solder cupped!) to the DB37 Heavy d. 2 Soldering or crimping; 3. by 87ponygt » Wed Dec 30, 2015 3:22 pm. MS3Pro EVO Standalone Engine Management System w/ Harness. Note that the DIY Autotune wiring harness has a shielded wire – connect only the inner wire to this pin! Connect the E pin to MS3X pin 14 to send the timing signal to the HEI module. MegaSquirt MS3X Wiring Bundle - Length = 23" ~23" of TXL High temp automotive grade wire. The crank position input, is has the red wire from point 25 meeting the black from point 8 and then connecting to a blue and yellow wire at the pigtail. 99. Distance Rating. 49 IATwPiggy: Intake Air Temperature Sensor $9. At least that's what the wiring diagram that came with it says. MS3 wiring harness colours - standardisation. Color coded wiring. The ground. Description. Yes, they are completely un-necessary,, but I use them for the above reasons. Wiring harnesses at carid. 1988 Porsche 911 Carrera. Number Of Wires: 3. All I have are the ignition coils from the original bike. Ibrahim Nzioki On Twitter 2 Engine Harness Layout Since The Donor Was From An E36. 3 high current digital/pwm outputs. To access the remaining two connectors on the wiring harness you need to move over to the driver side and discconect them. I have just recevied a MS3 card and in anticipation of obtaining a MS3x, after reviewing the latest MS3x wiring schematic, pin 2 is now shown as a ground. Jacob Hernandez. MegaSquirt wiring harness, Innovate Motorsports LC-1, and LM-1 Wideband O2 Sensor systems and gauges, and ignition. MS3X on 2010 Camaro LS3 + Whipple @ 10psi + HPT + AEM 30-0333/0334 WB. If you have any further information, contributions, or questions about this article, please contact us. . 3) MS3 Cam Input (Dual VR v2. 99. 1. Posts: 70. ‘Optional’ MegaSquirt Relay Board – Assembled Unit. 0, solder a 1K resistor to a length of wire and run it from the 5 volt point in the proto area to the TachSelect-VRIN jumper. Harness Length and get Free Shipping on Orders Over $109 at Summit Racing! Shop the Labor Day Deals and Save Now! Vehicle/Engine Search Vehicle/Engine Search Make/Model SearchSimply choose your injector style from the drop down menu! This package includes an MS3Pro 1st Gen ECU. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. This version of the documentation applies to: • MS3 on a V3. Remove the entirety of the engine wiring harness. 02 with MS3x board on a v3. Ms3x forums Megasquirt wire executing experiment mega ii plan part Ms3 and ms3x wiring questions Megasquirt ms3x wiring diagram. 2 Megasquirt Installation; 2. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. Just swap wire from fidle to inj1 or 2, install jp7 jumper and put 1k. MS3Pro EVO Standalone Engine Management System w/ Harness. 9 Magnum.