Hi, I am looking for assistance in diagnosing a couple of issues. a loud whine when the car is running and a popping sound. I can provide my observations and hopefully someone can help guide me through further process of elimination. Currently i have a Pioneer HU, one 4-channel amp,, dist block, and crossovers for the front component speakers

- With the car started, there is a loud whine which s constant, with the car in accessory mode, the whine is not present.
- When using the power windows, the whine is presented loudest. When accelerating, the whine increases.
- loud popping sound when going from volume level 0 to 1 and 1 to 0, also and when changing radio stations (in accessory mode) Also when turning on / off the car
- no popping sounds when increasing volume or leaving radio playing (in accessory mode)
- I tried using different sets of RCA cables on the rear speakers alone, then the front speakers alone. The popping continued in each scenario. (accessory mode)
- I removed each speaker wire from the amp, one by one, the popping continued.
- distribution block lost it's ability to show the voltage, perhaps some clue or maybe irrelevant. Fuses are not broken and it is grounded. Amp powers on fine.

Can anyone make sense of this or help guide me to next steps to troubleshoot further. With the whine with the power windows, i'm thinking a power wire is touching metal somewhere? I'm overwhelmed, please help