And wrapping the RCA grounds appears to have stopped my alternator whine. I'll know more if it comes back since I will be playing in traffic for at least 90 minutes tomorrow, but if it is the pico fuse/capactor/resistor/whatever, Pioneer can get boned with the cocks from 1,000 whales!
2019 WRX Limited - Stock HK for now while waiting on parts to be developed...