 D-Jet ground, Best location? |
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| Flyinlow |
 Dec 14 2025, 05:32 PM
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#1
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Flyinlow  Group: Members Posts: 103 Joined: 17-October 20 From: British Columbia, Canada Member No.: 24,774 Region Association: Canada 
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Would like some help… Three sets twin white wires 74 2.0 D-Jet harness I believe are the ground wires.Does anyone have a picture of how this works TIA Dennis
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| JeffBowlsby |
Dec 14 2025, 06:20 PM
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#2
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,139 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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They connect to a trispade terminal which mounts to the upper engine case, rearmost case bolt.
Attached image(s) 
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| windforfun |
Dec 14 2025, 06:50 PM
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#3
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Advanced Member Group: Members Posts: 2,082 Joined: 17-December 07 From: Blackhawk, CA Member No.: 8,476 Region Association: None
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Clean all your connectors with a wire brush & deoxit. Great grounding is fundamental in any electrical system.
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| Flyinlow |
Dec 15 2025, 10:47 AM
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#4
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Flyinlow Group: Members Posts: 103 Joined: 17-October 20 From: British Columbia, Canada Member No.: 24,774 Region Association: Canada
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QUOTE(JeffBowlsby @ Dec 14 2025, 04:20 PM)  They connect to a trispade terminal which mounts to the upper engine case, rearmost case bolt. Thank you was looking for something like that but seems to be missing… I’ll make it work |
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| Ron914 |
Dec 15 2025, 11:36 AM
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#5
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Member Group: Members Posts: 471 Joined: 19-April 22 From: Huntington Beach,Ca Member No.: 26,487 Region Association: Southern California
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| Highland |
Dec 15 2025, 06:12 PM
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#6
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Senior Member Group: Members Posts: 558 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California |
Curious why there are multiple ground wires on the FI harness. Why not just 1 wire or ground the ECU case to the mount (chassis)?
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| Flyinlow |
Dec 15 2025, 06:30 PM
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#7
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Flyinlow Group: Members Posts: 103 Joined: 17-October 20 From: British Columbia, Canada Member No.: 24,774 Region Association: Canada
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QUOTE(Ron914 @ Dec 15 2025, 09:36 AM) Yes I see where you’re at there much easier than the original spot on 74 car…I can make something that will work there. btw it would seem I should have connected those ground wires before engine install… lesson learned!! |
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| JeffBowlsby |
Dec 15 2025, 07:18 PM
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#8
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,139 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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QUOTE(Highland @ Dec 15 2025, 04:12 PM) Curious why there are multiple ground wires on the FI harness. Why not just 1 wire or ground the ECU case to the mount (chassis)? 6 circuits total. 1 ground for each injector, 1 for the ECU, 1 for the TPS. They could be functionally combined into a single ground point. Probably configured this was for easy harness construction. |
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