Speakers pop when radio turned on

[MARK2000STANG]

I just installed an Alpine head unit in my 00 GT with Mach460. I used the wiring harnesses that have RCA for my front and rear and plug directly into my pre-outs. When the unit is turned on there is a loud pop comming from all speakers. Other than that it works well. I have checked all wiring and everything is correctly wired. Does any one know what could be causing this. Thanks.

 

[BBrinks]

Try wiring a 570 ohm resistor inline with the remote turn on wire. I think ford uses a 5-7v remote and with the alpine's 12v turn on, it might be causing it. If that doesn't work, you could always try something like this: http://www.crutchfield.com/S-XVpMFJ9wGxj/tech/kb327.html or http://www.sounddomain.com/sku/STISPSON

This could also be caused by a bad ground from the HU, so check that first.

 

[MARK2000STANG]

Thanks, I'll look into it.