Connecting a new vintage radio to a stock radio harness on 70 chevelle - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 6 (permalink) Old Jun 15th, 15, 12:15 AM Thread Starter
Bill
 
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Connecting a new vintage radio to a stock radio harness on 70 chevelle

Just purchase a radio from antique automotive radio. Is there suppliers who make a connector from the new 12 pin connector to the stock wiring harness on my 70 chevelle. Just bought new wiring harness and would prefer not hack into it. It is a 4 speaker system

Thanks
Wrrossi
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post #2 of 6 (permalink) Old Jun 15th, 15, 12:16 PM
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Bob
 
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Re: Connecting a new vintage radio to a stock radio harness on 70 chev

What speaker system is in the car now?
What are your plans and LOCATIONS for speakers ?
70 2 drs. and 4 drs. had a stand alone stereo harness. This harness would help. It would locate the wires in the correct location and you would have FOUR speaker connections. Or get some Silver / Gold speaker wire and have at it.
Doing a Nice & Neat install in VERY time consuming. Removing a lot of parts & Pieces.
Or a fitz / All harness, Then start to solder. Many ways to do this install.
You pick what is best for you. Speaker, Ohms load?
Bob


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post #3 of 6 (permalink) Old Jun 15th, 15, 9:16 PM Thread Starter
Bill
 
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Re: Connecting a new vintage radio to a stock radio harness on 70 chev

I have a 70 2 dr and wired using 4 speaker harness from M&H wiring. I have not purchased speakers yet . Was hoping for a plug & play as opposed to actually removing the connectors in the new harness from M&H. Never know, might change my mind in future and install an original radio. Thanks for the input
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post #4 of 6 (permalink) Old Jun 15th, 15, 9:41 PM
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Joe
 
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Re: Connecting a new vintage radio to a stock radio harness on 70 chev

Quote:
Originally Posted by Bill Rossi View Post
Just purchase a radio from antique automotive radio. Is there suppliers who make a connector from the new 12 pin connector to the stock wiring harness on my 70 chevelle. Just bought new wiring harness and would prefer not hack into it. It is a 4 speaker system

Thanks
Wrrossi

Even if they did, this wouldn't work.

The original audio systems in these cars use a non-floating ground which means each (-) side of each speaker actually returns back to chassis ground.

Modern audio uses a floating ground, each speaker has two dedicated wires completely isolated from chassis ground. Grounding a speaker connection in any manner on a modern stereo will instant result in you have a much lighter wallet immediately.

Even if you were to ensure isolation--The '70-72's rear speaker harness only has (3) wires, a common ground, then a left (+) and the right (+). That common shared ground would most definitely foul things up. In the very least you will have to run an additional wire to the rear deck so there would be a total of (4) wires available to you--2 independent wires for each speaker.

You may have to upgrade your speakers as well for un-objectional audio quality with a more powerful stereo. The factory units used 10 ohm speakers. Modern speakers are 4 ohms to provide more power dissipation.

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post #5 of 6 (permalink) Old Jun 15th, 15, 10:17 PM Thread Starter
Bill
 
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Re: Connecting a new vintage radio to a stock radio harness on 70 chev

Good information and the operating instructions for the new radio is clear not to use original speakers and to use 4 ohm speakers.
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post #6 of 6 (permalink) Old Jun 16th, 15, 9:44 PM Thread Starter
Bill
 
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Re: Connecting a new vintage radio to a stock radio harness on 70 chev

Thank you for the information. Definitely makes sense the way you explained it.
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