Need help with radio wiring

[k51977blazer]

I have 1976 blazer the problem I’m having it has a has a aftermarket wiring harness these are the wires that I have for the radio I believe, 2 red Wires one black wires assuming the black is ground where would I put the yellow wire coming from the radio and red wire coming from the radio

 

[k51977blazer]

I also have this purple wire

I have 1976 blazer the problem I’m having it has a has a aftermarket wiring harness these are the wires that I have for the radio I believe, 2 red Wires one black wires assuming the black is ground where would I put the yellow wire coming from the radio and red wire coming from the radio

View attachment 346832

 

[ktmoutfront]

You need to check to see what the 2 red wires do. Is one always on and one key on? Never assume any thing on wiring you did not install. Check the black to be sure it is a ground.

 

[k51977blazer]

Ok thank you

 

[ktmoutfront]

A test light is your friend.

 

[Wes Harden]

That purple one should be the 12 volt crank power to starter solenoid. It should be connected to the nuteral safety switch.
As @ktmoutfront says confirm this with a volt meter or test light.

 

[ktmoutfront]

That purple wire is on the wrong side of the firewall to run to the starter. What is the other end attached too?

 

[Wes Harden]

goes from ignition switch to neutral safety switch to bulk head connector, to starter

 

[k51977blazer]

Got the radio hooked up everything is good test light was my best friend I’ll trace the purple wire tommorow and see where that goes thanks again everyone

 

[ktmoutfront]

I am guessing that that purple wire is for something else. Added on. To long for under the dash for factory application.

 

[k51977blazer]

The purple wire is for a tachometer