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Old 03-22-2018, 08:37 AM   #1
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Originally Posted by dghii View Post
There's nothing unique about the P-car's stereo system.

Given that both your door and dash speakers are dead on the same side, it sounds like you have an amp or wiring harness problem. Go to your wiring harness on the back of your new head unit and swap left and right channels to see if you get any change. You might have to cut wires or you can jumper wires from the working side to the non working. If no change, you can bypass the the harness from the radio to the amp and do the same jumper trick at the amp input.

Can also run HU speaker outputs to the (disconnnected) output connector on the amp.
The head unit outputs directly to speakers from the output harness of the amp is my probable route. I'm just wondering about pulling the wires back in from the front trunk to the cockpit. I found the wire color codes in the service manual.
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Old 03-22-2018, 09:50 AM   #2
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I take it you have a factory 4 channel amp?

Asuming all you did was replace hu and used an adptor kit you should check your wiring connections again.

For the factory amp you need to use rca out of hu, the factoryamp wont take line level input signal.

I am in the process of doing a complete ugrade, myself. I tried 5he 6 channl amp route and is ok, and easy mod but better off with complete system upgrade.
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Old 03-22-2018, 10:00 AM   #3
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Originally Posted by Cunningr View Post
I take it you have a factory 4 channel amp?

Asuming all you did was replace hu and used an adptor kit you should check your wiring connections again.

For the factory amp you need to use rca out of hu, the factoryamp wont take line level input signal.

I am in the process of doing a complete ugrade, myself. I tried 5he 6 channl amp route and is ok, and easy mod but better off with complete system upgrade.
Yes all connection are good, and I used the RCAs. The system was only playing 1 channel out of for BEFORE the install as well as after. I hoped it was the head unit, but apparently it is the amp. I'm seeing used ones on Ebay for cheap, so I may take that route instead of dissecting the output side of the amp harness. will ohm out speakers first to eliminate the possibility of 3 blown speakers. The RCA wiring from the amp harness appears ok.
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Old 03-22-2018, 10:54 AM   #4
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Originally Posted by Stiles13 View Post
Yes all connection are good, and I used the RCAs. The system was only playing 1 channel out of for BEFORE the install as well as after. I hoped it was the head unit, but apparently it is the amp. I'm seeing used ones on Ebay for cheap, so I may take that route instead of dissecting the output side of the amp harness. will ohm out speakers first to eliminate the possibility of 3 blown speakers. The RCA wiring from the amp harness appears ok.
Yeah i bought a 2 channel amp for $20. I am taking out the plugs and fabricating a factory to aftermarket amp interface. If you go back stock get a 6 channel from a cabriolet if you dont have rear speakers you can use the fad to adjust door speakers.
The door soeakers only play bass by the way.

If you do go with a 6 channel you may need to trim a key off the amp so the plug will fit. There us a thread about that some where.
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Old 03-22-2018, 04:57 PM   #5
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I was having weird electrical problems with my drivers door. It turned out to be the door harness from the door that plugs into the A pillar. Apparently some of them are prone to leak. I loosened mine up and a bunch of nasty, corroded water ran out. I had to clean up a couple of connections. Everything came back to life. There must be 20+/- wires that plug together in that plug/socket.
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