Sorry for the title I didn’t know what to write. I installed a system on my own, and everything went well until I installed a pos Fosgate amp, which after hours of troubleshooting I find out its no good because it is putting out .5v on the input side of the AMP. Which screwed up 3 HU, a pioneer AVIC D1 and two AVIC Z1. I just wanted to know if there was a simple way to fix the HU's or if I am just SOL. I just hope that my HU backfeed by .5V is not enough to permanently destroy them. Any help please...