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1978 OEM AM/FM Stereo wiring

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Old 07-27-2020, 09:28 PM
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Smile 1978 OEM AM/FM Stereo wiring

Hey guys, I have done some forum searching and haven't quite found my answer.

My truck originally had a Mono stereo, but the PO had an 80s cassette player put in. Thankfully, he only tapped into the cigar lighter for his 12V key on, I soldered that back together and all is well.

I found myself an OEM AM/FM stereo unit, and yes, it is the short case unit. I made sure of that. I bought a wiring kit off of ebay and it's all in Dennis Carpenter bags, It's the complete kit. From the back of the radio to the door speakers. My question is, I am not sure what is + or - for the kit. the wires are purple and orange.

I am only running 2 kicker speakers and thats it for the time being.

Is there anything else I need to pay attention to?

Thanks everyone!
 
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Old 07-27-2020, 10:07 PM
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A little info I have saved up over the years, hope it helps.

"The OEM radio was powered by a GREEN 2-terminal pigtail. YELLOW with a BLACK stripe is switched power, BLUE with RED stripe is dash illumination. Do not mistake the BLUE with RED stripe wire for ground. The OEM radio grounded through its mounting chassis. The speakers were connected over a separate pigtail.


It's not the stock radio wire because the stock radio didn't need hot-at-all-times power (EXCEPT the factory digital AM radio for clock memory).

solid black—power
blue with red stripe--dial light
black with gray dashes—ground
orange with green dashes--right speaker
white with green dashes--left speaker


Assuming an AM/FM stereo and stock wiring harness'.
Purple is ground, right speaker is white and left speaker is orange.

The speakers are in series meaning positive from radio to positive on speaker #1, negative from that speaker goes to positive on speaker #2. Negative from Speaker #2 goes to Negative on stereo.


 
  #3  
Old 07-27-2020, 10:16 PM
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Hey Rich, thanks!

Thankfully, the OEM radio and the harness are all together and good. The only issue I have is the wiring of the speakers.

With the wiring inside the doors, the only wiring to connect to the speakers is Orange and Purple. For both sides.
 
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Old 07-27-2020, 10:21 PM
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Originally Posted by 77&79F250
Purple is ground, right speaker is white and left speaker is orange.


So... maybe I figured it out, ha ha,

Purple would always be ground? and then orange will be positive? on both sides?



 
  #5  
Old 07-27-2020, 11:28 PM
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Makes sense to me. And for the record I did NOT stay in a Holiday Inn Express last night either. It was a Crown Plaza......
 
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