750 with premium harness blowing fuse

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Joined: Tue May 25, 2021 1:48 pm

750 with premium harness blowing fuse

Postby SteadFast » Mon Oct 25, 2021 2:05 am

I have a 750 elite with the premium wiring harness on my 1975 BMW 2002. I just got dyno tuned at it was running great. Then all of a sudden after a few days of driving it now blows the main ECU fuse the second the key cycles on. I'm going to guess it is some sort of ground fault. What would be the best way to diagnose this issue? Visually I don't see any issues. I assume I'd check for ground continuity for the power wires and sensor power wires? Suggestions?


Posts: 602
Joined: Wed Jan 12, 2011 3:28 am

Re: 750 with premium harness blowing fuse

Postby JimKden » Tue Oct 26, 2021 12:38 am

Try disconnecting the harness plug at the ecu. With key off check for a short to ground on pin 26 on the harness side of the main connector.

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