Car Stereos: stereo in camaro, help., gm radios, stero

Question
Hi, couple of questions...when I went to install my new stereo in my 97 camaro..I had attatched the universal installing harness to connect the new stero with the car's original harness, and I'm assuming Im having the fuse the wires together, "the wires from the new stereo and thewires from my bought harness..." is this so?

My question is, that I have the harness from within the car, but there is like a separate additional harness, "smaller, "coming from within my car.." What is this for?? Because the instructions from JVC do not call for anything but the connection of the one main harness to the main and only plug of the new stereo. "there is no additional plug for this other harness coming from within, there is just like a red and white connection holes on the new stereo...but in neither the box nor the installation kit did i find little red or white insert cords..Can you tell me why I have this extra harness, is it necessary to have connected to something?

Also, if I just cannot figure this out, is there a place that I can take the car to and get this installed for under $3o? Or even where to go to look?

Thanks for your help.

Answer
Hi Nick,

It's very common for GM radios like yours to have an extra plug in addition to the 4-part main plug. It might be used for a separate CD or cassette player, steering wheel controls, or a speed-controlled volume system, for example.  Usually there's nothing in this additional plug that's required for an after-market head unit.  Just connect the main plug and don't worry about the extra.

Hope this helps!

Brian