Upgrading radio

[drsantos]

What wire from the old radio harness willl provide 12 volts constantly to the new radio. (1981)

 

[Bob Chadwick]

On my 77 I had to find a constant hot source and ended up pulling power off the cigarette lighter.

Bob

 

[Yoda]

drsantos,
I'll look at my GM Shop manual tonight when I get home.. Unless one of our other L81ers chimes in before hand

 

[quickjagg]

re:

Doesn't it say on the back of the old radio which color wire is the 12v? It did on mine, might be worth checking.

 

[Yoda]

Looking at the schematic from my Shop Manual, it appears there is a RED wire that is the Hot wire, there is a Yellow wire that is from the ignition switch, and the purple wire controls the brightness of the lights in the radio via the dash dimmer control switch (head light switch).

BudD