The only wire colors I have are for the original GM radio. This is a drawing I made to hand out at an old car show swap meet.
I had a '98 GMC truck at my community college that I think is the same as yours. The GM dealers couldn't fix it so they donated it to us. I put some electrical "bugs" in it and some had to do with the "gauges" fuse. I'm on a borrowed computer right now, and thanks to a major house fire, I'm sitting in the library parking lot using their wireless internet. I have the dash gauges information on an older computer at home. I'll try to find that tomorrow so I can tell you what to look for.
All I can remember is it was a red, ten amp fuse, and along with the gauges, it fed the "Battery" lamp circuit that got the generator started. The students ran into additional problems when the instrument cluster wasn't bolted in tightly. The connector is rather unusual and the cluster has to be held in for it to stay connected.
Most likely I can't help with your new radio but I can offer some suggestions. Tell me the brand and about how old it is. I only repair original equipment radios and I specialize in Chrysler stuff, but I do have some installation manuals for a few aftermarket radios.
As a general rule, the 12 volt memory wire is pink. It needs 12 volts all the time to maintain the station presets and clock. The ignition 12 volts from the ignition switch is red. Those two turn the radio on. Once the radio is on, the switched 12 volts wire will have 12 volts on it to power an amp or power antenna if they're used. That is usually dark blue but it could be yellow. If you have any double wires, those will be for the speakers. Most commonly I see a pair of gray wires, white wires, dark green wires, and light green wires. You could also have two dark green wires for a front speaker, and two dark green wires with stripes, (tracers), for a rear speaker.
Some less-expensive radios only have six speaker wires instead of eight. When there's eight, two are for each speaker, one in each corner. When there's six wires, one goes to each of the four speakers, then one splits and goes to each right speakers' second terminal, and the other one splits and goes to each left speakers' second terminal.
In all original radios, and all but the cheapest aftermarket radios, no speaker wire can go to ground like they did in most cars in the '70s. Touching any speaker wire to a metal part of the vehicle will usually damage the radio.
Wednesday, October 15th, 2014 AT 12:39 AM