I am putting in a Panasonic CQ-C7105U in my tahoe and the radio came with a wiring harness along with another harness that came with the dash kit. I wanted to connect the two wiring harnesses together so that if we sell the car I can take the after market out and put the factory back in easily.The only thing I notice about the different harnesses is the gauge of the wires. there is a yellow wire on the panasonic harness labeled battery 15a and from what I understand the orange wire on the other harness is the battery wire for that. Does it matter that one battery wire is larger than the other? The same thing also occurs with the ground wire. (other wires seem to be the same)Also there are two blue wires on one and one blue wire on the other? Think they are the turn on wires, if so why would there be two?
it doesn't matter about the guage as long as the wire from your truck is bigger the blue wires should be speaker
