Need Help! Annoying Alternator Wine

[CerwinVega_Fan 10+ year member]

Read the sticky on alternator whine. It's ALWAYS due to ground loops. The HU ground is different than the amp ground and you get ground currents running through the RCA shields. Different cables SOMETIMES helps, but the real issue is GROUNDS GROUNDS GROUNDS GROUNDS GROUNDS GROUNDS GROUNDS.
I have that same JVC deck and it's fine.

So a gound loop isolator would do the trick?

 

[maylar 10+ year member]

So a gound loop isolator would do the trick?

That's basically what they're for, yes. People don't like them because you can lose SQ depending on the manufacturer but sometimes they are a viable solution. I have an install in an old car that's simply impossible to get equal grounds between the amp and HU. Isolator fixed it.