In my VW, the aftermarket wiring adaptors short out the diagnostic wire to constant +12v.
I want to bypass the factory stereo wiring altogether and run new power and ground cables to the switched +12v fuse panel under the dash.
What wiring gauge would you recommend, running a pioneer 3200bt, but the internal amplification will be switched off as amplification duties will be done by an external amplifier.
Would a 12ga wire be enough for a head unit? Or would you go larger/smaller? Run will be approx 4 feet.