Brake lights affecting gas gauge?


After doing more wiring harness stripping, I’ve put almost all the car back together and everything seems to work fine, with the exception of one thing.

Every time I tap the brakes, the gas gauge and temp gauge twitch and read a little differently. From looking at the ETM, I can only see where they connect at the G300 ground. Is there anything else that could cause this strange issue?



The obvious suggestion is a bad ground somewhere, but no idea where you should look. Depending on how you trimmed wires, you may have something that used to be a ground touching something that used to be hot.


Two grounds to check. The one under the back seat. The massive one under the dash around the clutch. (I’m out of the country so I can’t be more precise)