 Convert back to D Jet Fuel Injection-, Wire harnessess- Injector Ground |
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| young55961 |
 Jun 18 2026, 02:34 PM
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Member  Group: Members Posts: 53 Joined: 15-March 18 From: Arcadia Member No.: 21,972 Region Association: Southern California  |
I have a question about the ECU wiring harness.
There are three pairs of white wires with female spade terminals on the harness. I believe they are the ground wires for the fuel injectors, but I can't find where they are supposed to connect. Should these wires be connected to the negative (-) terminal of the ignition coil? If anyone has a photo showing the correct connection, I would really appreciate it. Thank you! |
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| GregAmy |
Nov 1 2026, 12:31 PM
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Advanced Member Group: Members Posts: 2,712 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States 
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From my Microsquirt build notes.
T4-I .75 and .5mm Into ECU pin 16 (.75) and 24 (.5) Circuit 87, powered by engagement of the power relay. Medium-size circuit, relayed from large 30. #24, .75mm (~18AWG) goes to injector drivers. #16 .5mm (~20AWG) goes to power ECU and sensors. T4-II .5mm Into ECU pin 18, power from T14-1 (track 81) start power to starter solenoid via 12-6; signal to ECU of start circuit T4-III .5mm Into ECU pin 19 86, ground side for fuel pump relay. T4-IV .5mm Power from T14-1 (track 81) start power to starter solenoid via 12-6; CSV engagement  |
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Posts in this topic
young55961 Convert back to D Jet Fuel Injection- Jun 18 2026, 02:34 PM
brant There was supposed to be a three prong connector o... Jun 18 2026, 02:46 PM JeffBowlsby 2 of the three pairs are injector grounds. The th... Jun 18 2026, 02:46 PM
young55961
2 of the three pairs are injector grounds. The t... Jun 18 2026, 02:52 PM Ishley Here is what you’re looking for in the yellow ci... Jun 18 2026, 08:12 PM young55961
Here is what you’re looking for in the yellow c... Jun 19 2026, 10:54 AM DC_neun_vierzehn
Here is what you’re looking for in the yellow c... Jun 19 2026, 03:54 PM young55961
[quote name='Ishley' post='3261972' date='Jun 18 ... Jun 19 2026, 08:17 PM Jack Standz It's easy enough to get one. Here's one e... Jun 19 2026, 03:44 PM Ishley Mine is a '72 1.7 that I rebuilt into a 2056. ... Jun 19 2026, 04:25 PM Dave_Darling Mine is further back, right by the flywheel end of... Jun 19 2026, 09:27 PM DC_neun_vierzehn
Mine is further back, right by the flywheel end o... Jun 22 2026, 05:27 AM robkammer Mine is right at the top of the case split at the ... Jun 23 2026, 05:38 AM friethmiller :popcorn:
Observing... learning. I'll be do... Jun 23 2026, 07:33 AM young55961 I'm trying to test-run my 1975 Porsche 914 2.0... Nov 1 2026, 12:22 PM Dave_Darling I'm pretty sure that #31 should get grounded b... Nov 1 2026, 07:04 PM |
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