72 Mustang AM/8Track speaker issues

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Jaysay

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Jan 24, 2022
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72 Mustang Fastback 351c 2v
On my 72 mustang I have good sound out of my driver speaker, but my passenger speaker only works at max volume, left/right speaker balance works as it should and doesn't change the issue. I’ve put a test light to the wires an there is no power to the speaker until the volume reaches a certain point. Should i be looking at the connections or is it likely the radio’s internal resistor for that side?
 

351c1971

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1971 Mach1
I am not an expert but it looks like the volume control resistor has an internal open circuit or a broken wire.
 

Jaysay

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72 Mustang Fastback 351c 2v
Yeah, after spending a few hours doing some tests that’s what I’ve narrowed it down to. I hardly ever find a reason to balance my speakers between left a right, so i made a splitter wire that goes to both speakers using the driver side speaker power wire. Seems to work good, an can’t foresee any problems that may occur with that setup so as long as no one warns me of something, I’m gunna run with that lol
 

1973 Mach-1

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Arizona car, 1973 Mach-1, Still has its original 351 Cleveland engine and its original C-6 trans, All original body panels, most of original paint. Interior is restored.
Have you tried DeoxIT spray? It's an easy fix if the balance or volume potentiometer is the problem.
 

Jaysay

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Yeah i tried basic electronic cleaner an then made the trip to our shop a picked up some DeoxIT there, neither had any effect. And the music sounds exactly how it was before from what i can tell. It is the original factory AM/8track radio.
 

1973 Mach-1

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Arizona car, 1973 Mach-1, Still has its original 351 Cleveland engine and its original C-6 trans, All original body panels, most of original paint. Interior is restored.
It sounds like you're pretty savvy in basic electronics, Jaysay. You could check out ebay for a "Parts" AM FM 8 Track Player, and swithc out the balance pot, and see if that makes a difference.
 
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