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Old 07-17-2014, 12:27 AM   #1
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Radio with single/combined negative wires?

I have a 1991 Mallard Sprint (Chevy) with an Audiovox AV-686 radio. It powers 4 speakers in the RV (2 front, 2 rear), but there's only 2 negative wires on the radio. Positives are labeled front/rear, but not for the negatives.

I want to replace the radio with a new CD player and speakers, but not sure how to wire the negatives. Are the rear speakers chassis-grounded perhaps?

Radio image is attached.

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Old 07-17-2014, 07:02 AM   #2
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is the picture the old or new unit?

FWIW some amplifier designs need a separate non grounded return and some do not. I would go with the what the new unit needs. That could be a problem if trying to replace an common ground system with a floating output system.

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Old 07-17-2014, 11:56 AM   #3
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Originally Posted by nothermark View Post
is the picture the old or new unit?
The picture is the old unit. The new unit is the typical positive/negative per speaker.

Someone said to combine the 2 left negatives into the single left negative wire and combine the 2 right negatives into the single right negative. Not sure if that would work.
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Old 07-17-2014, 12:15 PM   #4
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The rear may well be chassis grounded, that is fairly common. Or they may be routed up to the front,, Often the "negative" speaker wires are common.. NOT ALWAYS, but often.

Suggestion: Download owner's manual for both existing and replacement radios and see what it says, OF both allow common grounding, you are in business.
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