Hey Guys,
I have had this ever since I wired up the system, and have started trouble shooting, and its driving me nuts!
When The unit powers on (even with engine off), I get a loud pitch whine through all speakers. Here are some general setup details, and troubleshooting done:
1. System - Pioneer Avic F90BT. PG RSD 500.4 Amp. PG RSDc 6.5" Comp set. Redtop Batt.
2. 0ga wiring for + and - all the way to the back. 14ga for speakers, and DBLink/Monster RCAs (most is for more gear)
3. When RCA is unplugged from amp, noise gone
4. When RCA is unplugged from deck only, noise gone