Grounding ECM
09-11-2021, 06:36 PM
#1
Grounding ECM
The schematic shows a ground from the ECM to firewall. I can not find the ground on the firewall. I at one time saw that there is a chart that tells and shows where , specifically, this ground. Where may i find such a chart? Thanks, Frank
09-11-2021, 07:06 PM
#3
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Grounding ECM
grounded to passenger side rear of cylinder head
Several of the wires in the harnesses that connect to it, the black w white stripe ones, end up there.
09-11-2021, 09:05 PM
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Grounding ECM
Regardless of the original/ Stock Ground location...
It would be ideal to have the PCM Ground connection terminate (directly) at the Negative-Terminal of the Battery.
The PCM 12V+ also should be changed/ moved to the Battery as well.
The Stock PCM Connections are something that we (Packard Electrical Engineers) overlooked back then (Sorry
)...
Now we know better, and need to segregate the Dirty-Ground Connections, from the Clean-Ground Connections.
It would be ideal to have the PCM Ground connection terminate (directly) at the Negative-Terminal of the Battery.
The PCM 12V+ also should be changed/ moved to the Battery as well.
The Stock PCM Connections are something that we (Packard Electrical Engineers) overlooked back then (Sorry
)...Now we know better, and need to segregate the Dirty-Ground Connections, from the Clean-Ground Connections.
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