Radio/Fader Switch/Rear Speaker Issue

[6T8GTX]

I'm wondering if someone can help me troubleshoot a radio issue I'm having. I recently had the dash and engine wiring redone on my '68 GTX and now the rear speaker isn't working. The radio is working properly and sounds good out of the front speaker. I have the rear speaker fader and was told it might be that switch. The switch seems to work, though. When the radio is on, turning the fader switch toward the rear speaker will make the sound fade from the front until you can barely hear it at all. I checked the rear speaker and it has the right resistance and responded to a test with a 9v battery so I think the speaker should work properly. I checked the fader switch-speaker wire connection behind the kick panel and it's hooked up (I actually can't separate that connection). It seems like the signal isn't getting to the rear speaker. Is there a way to test that? Any other thoughts on what the problem might be? Thanks in advance.

JD

 

[PRND21]

Use a couple of test leads to a separate speaker at the fader and then at the rear speaker.

 

[6T8GTX]

Use a couple of test leads to a separate speaker at the fader and then at the rear speaker.

When you say test leads, I'm assuming I should use a multimeter to test it. If so, which setting do I use on the multimeter and what am I looking for? I tried to research that before posting but couldn't find any good info on how to test the connection and signal that way. Any additional info would be much appreciated - this is new to me and I need all the help I can get. Thanks.

 

[PRND21]

When you say test leads, I'm assuming I should use a multimeter to test it. If so, which setting do I use on the multimeter and what am I looking for? I tried to research that before posting but couldn't find any good info on how to test the connection and signal that way. Any additional info would be much appreciated - this is new to me and I need all the help I can get. Thanks.

No, I was just saying a couple of wires with alligator clips hooked to an extra speaker. Clip the other ends to the existing speaker wires in your trunk and see if the extra speaker works. If it does then the speaker is the problem. If it doesn't, can you hook them to the back of the fader? That would tell you if the wiring is bad or if the fader is bad.

 

[6T8GTX]

I should be able to check a different speaker at the back but I'm not sure whether I'll be able to check a direct output from the fader. It will depend on whether I can reach the connection under the dash. I'll give it a shot. Any other possible ways to test the switch?

 

[PRND21]

Possibly with an ohm meter being it's a variable output switch. You'd still have to have access to the switch.