GMC Troubleshooting Questions? Ask a Mechanic for Answers
How old is the battery? I know this seems obvious, but it can be very easily overlooked and if it is newer have you had it tested? It really sounds like a battery with a bad or loose cell.
That sounds like a very loose ground shorting out somewhere behind the instrument cluster. I would pull the cluster and see if I could find where the short is.
I hope this helps.
That is very strange. I have never heard of that before.
I would start by checking the instrument cluster circuit.
There is no circuit breaker or relay there that I am aware of. As for the reverse switch short causing this issue I think that would be very impossible. The issue you describe with the noise, sounds like a loose connection behind the cluster.
Yeah, that sounds good. I am glad to help!
Please rate me if you can, thanks.