No Sound After Audio Install, 1991 Chevrolet 1500 C Series Pickup

the factory amp/tuner is above the gas pedal just to the right. That's where the controls for the stereo (above ac controls) plugs into and the if it had the tape deck in the center. There should be a harness plugged into that that fits the gm-4001 harness that give you all you powers/ground/speakers connections that run up to the center below the air vents and also has the antenna connection in it33 years as a installer now just a retired old guy. Favorite thing to install/topic are remote starts/car alarms. Stop using test lights!!!

If you have those color wires, those are the wires that plugged into the factory amplifier. They WERE plugged into the amplifier in the beginning. Do not know who was the first one to put a radio in the truck, but they unplugged the 3 plugs from the amplifier and wired the radio up to those wires. They bypassed the amplifier right out of the gate.

Thank you for your reply to my question and I was aware of the receiver being in that area The tuner was a three way device so it's possible... Right ? Kevin C.

Is what possible? Bypassing the factory amplifier?

Radio 12V     orange     +     radio harness           Radio Ground     black     -     radio harness           Radio Ignition     yellow     +     radio harness           Radio Illumination     gray (dimmer)     +     radio harness           Factory Amp Turn-on     pink     +     radio harness           Left Front Speaker (+/-)     tan - gray     +,-     radio harness           Right Front Speaker (+/-)     lt. green - dk. green     +,-     radio harness           Left Rear Speaker (+/-)     brown - yellow     +,-     radio harness           Right Rear Speaker (+/-)     dk. blue - lt. blue     +,-     radio harness you may not be getting any sound because you have a blown speaker, have the speakers been replaced in the last 5 or years?33 years as a installer now just a retired old guy. Favorite thing to install/topic are remote starts/car alarms. Stop using test lights!!!

The above wiring info is for 1995 and newer. Your factory amplifier is no longer in your vehicle. Or at least it is not still connected.

i am an idiot wrote: The above wiring info is for 1995 and newer. Your factory amplifier is no longer in your vehicle. Or at least it is not still connected.

this should be wire colors that are in this truck (verified by all data), we all know GM doesn't change there wire colors..ever . This is so OP can check his wire colors to the radio33 years as a installer now just a retired old guy. Favorite thing to install/topic are remote starts/car alarms. Stop using test lights!!!

His truck does not have an amplifier turn on wire. In order to put a radio in this vehicle you must remove the 3 plugs from the Tuner/Amplifier box. The radio control piece in this vehicle is just a control piece. There are no usable wires at that device. The only place there are the standard GM wire colors are at the 3 plugs that WERE plugged into the Tuner/Amplifier. He keeps asking about bypassing the factory amplifier. I think I almost had him convinced that his factory amplifier was already out of the circuit. Then you came and posted about the pink amp turn on wire. That wire did not happen till 1995. Hopefully he does not get back on bypassing the amplifier, which is not there, or at least not connected.