It's been many years since I've had a good stereo system and that's all about to change here shortly. I recently installed a new Alpine deck CDE-175BT and just last week I ordered a Rockford Fosgate P1000X5 amp, RFC1D 1 Farad Digital Capacitor, RFCB140 140 amp circuit breaker, T1650 6.5" 2 way coax speakers, T1692 6"x9" 2 way coax speakers, Kicker Free air KFM104 subs, and a complete Fosgate wire install kit.
I have not, BUT I've also installed a 200amp Powermaster alternator and it still whines and I also ran a 4ga ground wire direct from the battery to the rear of the alternator and still no change.
When cars were simple and trunk amplifiers were new things were easier. If the whine mirrored motor speed it was the alternator or spark plug system. If it was constant it was the fuel pump, and the heater fan would be checked by changing it's speed. The newer the car the more sub systems that could cause problems. and the harder it is to solve.
Good audio equipment works with most bad installations. You seem to have done everything correctly. I hope the new head unit works out.
I was talking with a buddy who did stereo installs professionally for 13 years and was telling him about my stereo whine and the fact that if I turn the volume up loud enough eventually the whole system would shut off, deck and all. I had previously mentioned this to him but he says he misunderstood me and now knowing that even the deck turned off he believes I have a bad ground and possibly even a bad power supply to the stereo from the factory harness. Hopefully this weekend I'm going to run a new dedicated power and ground directly from the battery to the deck and eliminate the factory harness ground and power wiring. He suggested that I twist the wiring together to help create an RFI choke as well.
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