This is a list of wiring for the head unit in a 1991 Classic:
Color Key
B Black
K Pink
N Brown
S Slate (whatever that is)
W White
G Green
L Light
O Orange
U Blue
Y Yellow
Illumination Loop:
> RN - Illumination loop connects to panel dimmer rheostat. if this is crossed to power for the radio, it could explain why your radio is only working with lights on
Power & Ground
> B - Ground
> LG - Ignition Loop, connecting rear amp, front amp, head unit and fuse panel. LG connects to WO deeper in the wiring harness, which is ignition, so LG provides power when the ignition is turned to first setting.
> PW - Battery Loop, connects to Fuse B2, which is overhead lighting fuse, hence power from battery.
On control for remote devices: amps and cd player
>PY - Connects head unit, front amp, rear amp, i believe this is remote control to turn amps on and off
Speakers (from head unit to amp):
>BW - speaker - front amp - Right +
>BN - speaker - front amp - Right (-)
>BU - speaker - front amp - Left (-)
>BG - speaker - front amp - Left, +
>Red & White - should be in "Screened Cable" - Audio Inputs to Rear Amp, W - Rear Right, R - Rear Left
Other cables
> Data Link Cable = to CD player
> Antenna - only one thing it could be
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Pat Herman
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