Alternator Whine


Veteran Member
May 19, 2000
Los Angeles
I think ground loops can also cause that. Maybe try running the radio and amplifier grounds to the same point and ensure that that point is a good ground back to the battery.


Veteran Member
Lifetime Gold Member
Mar 13, 1999
Brighton, MI
I thought about running a separate large gauge ground wire back to the battery when I put it in. But I didn't, just lazy, as I recall. I may not have thought of it until after I had already run the power wire, and put the carpet and seats back in place ..

Grounds are definitely important. Our ECM, TCM, etc. controller specifications usually specify the controller must function normally with up to a 0.5V ground offset from the battery, although that number has bounced around over the years. I've never worked in the audio area, so I don't know if the radio head has a more restrictive requirement.