Does anyone know which wire from the head unit is the signal wire. I want the crossover and amp to come on with radio but not sure which of the million wires it is. I also have the factory 6 disc cd changer if that helps.

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97 F-150 S/C 4x4 ORP XLT 4.6 K&N , Flowmaster, Bosch+4 plugs,MSD 8.5 wires,Superchip.Patriot fiberglass toneau cover, Westin chrome step bars.
Future mods:4" lift,ram air hood,and a supercharger.

 

The blue and white wire should be the amp turn on. If it is not then run a wire from the fuse box to the amp, and put a toggle switch in the middle so when you turn on your radio then flip the switch. I did that once on a car when I got fed up with looking for it. Just a suggestion.
Thanks

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98 F-150 STX V8 black,tonneau cover
tinted windows

working on the rest

 

Thanks for the reply but it doesn't matter for me now. Bought a Kenwood cd player and installed it, got tired of messing with the factory setup.

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97 F-150 S/C 4x4 ORP XLT 4.6 K&N , Flowmaster w/dual tailpipes, Bosch+4 plugs,MSD 8.5 wires,Superchip.Patriot fiberglass toneau cover, Westin chrome step bars.
Kenwood 4011 stereo, Rockford 150a1 amp, Profile electronic crossover, and 2 10" JBL's.