I just installed an aftermarket HU (pioneer deh-p390mp) in my 2000 mustang gt with the mach 460 system. I used the Metra 70-5510 with the rca plugs and it sounds great, very solid bass. but, I do have a slight problem. whenever I turn on the car (engine and all), I hear a thump coming from the speakers. it's quick but very annoying, and after that, the radio works perfectly. however, if I just start the car battery and no engine, it does NOT do it. also, if I already have the car running and I take out a cd from the cd player (so it goes back to the clock on the unit), then switch to either the radio or put another CD in, it ALSO happens. I tried wiring in a 1watt 1k ohm resistor in with the blue remote wire (aftermarket turn on), but that didn't solve the problem like I'd hoped. any ideas?
FIXED. I had to put a resistor on the factory plug's remote turn on, I had one on the aftermarket radio's turn on.
Where? Where did you get the resistor, because I just put a new HU in my girl's 99 and am having the same problem.
