1986 Mustang GT Vert. Hello everyone, I am having a problem with my left rear speaker and am not sure where to start. I have taken the panel off and tested the speaker (on a house stereo and the right rear speaker wires). I have confirmed that the speaker works and that it is most likely a power/wiring issue. I am not sure how to test if the wires are getting power, or even how to trace where the problem is. If someone could lend me a hand on where to start looking or testing that'd be great. Thanks