My old pioneer deck quit. Went out and picked up a new one. It uses a smaller harness. I have a gm aftermarket stereo harness pluged into the fiero harness, the new pioneer harness gets connected to that. I'm having difficulty getting the thing to turn on. My car is an 88gt with the performance sound option. Anyone know what the small harness with with 2 wires is for? Is the constant12v and the switched power on the large harness with the ground?
Thanks for the reply. I have tried using those diagrams. The problem is that there are actually 2 harnesses my car has in there. One with only two wires on it orange and brown I believe. Then a second main harness which has all the speakers and the ground. My last deck was hooked up using a combination of these two harnesses. It's a little confusing I can't seem to get power to it.
[This message has been edited by Odin (edited 06-11-2014).]
Thanks for the reply. I have tried using those diagrams. The problem is that there are actually 2 harnesses my car has in there. One with only two wires on it orange and brown I believe. Then a second main harness which has all the speakers and the ground. My last deck was hooked up using a combination of these two harnesses. It's a little confusing I can't seem to get power to it.
On the smaller harness, only one of the wires is used for the pioneer. The adapter harness should only have one wire coming from it (stereo side). Look at the color of the wire and reference it to the link that was provided in the first reply. If it's orange, thats your constant 12V and should be wired to the yellow on the pioneer harness. If its yellow on the car, it is your switched 12V and should be wired to the red on the pioneer harness.
I like to use a small 12v electric motor to test the wires. Im sure you probubley allready know this, one wire is intermitant power (poweres the sterio, key on and off) and one wire is a constant 12V, for the sterio clock and memory.The remainder is your speaker wires.
The problem is that there are actually 2 harnesses my car has in there. One with only two wires on it orange and brown I believe.
I'm gonna guess that the orange is a power wire and the brown is for illumination. Your radio should have 4 wires:
Power in RUN - this is power to turn the radio ON and OFF Power Constant - this is power that keeps your saved radio station pre-sets in memory Illumination - this dims the display when you turn your lights ON Ground
Personally, I never do wiring without a multimeter. With a coupon, you can get one for free at Harbor Freight with a purchase [this should be worth a + ]
I just did the same thing to my car a few weeks ago. I literally messed around with it until it worked becasue I don't know anything about wiring, but now I do. In my case, it was a yellow and orangw wire. Those are the power wires. The other harness simply connects to the speakers.
Like Sardonyx247 said, since you have the premium sound that you need to hook up power to the subwoofer amp. This connection is not referenced in the wiring diagram you were linked to. On connection E there are 2 pink wires which power the amp. This would be a single wire on the adapter plug. This connection needs to be powered when the radio is switched on. So, the obvious thing to do is use the power antenna connection. This is normally the blue wire on an aftermarket stereo. One problem with this is the aftermarket radios only output enough current on this connection to energize a relay. The power antenna output is not meant to drive a load such as an amp. I had a woomp, woomp sound constantly when hooked mine up. I had to hook up an accessory relay that was switched on with this connection and powered through the yellow wire. Let me if you need more detail on the relay connections.