Installing an in-dash Ken Harrison Unit, and I can't get the rear speaker to work. The front in-dash speaker works, and I've followed the wiring diagram - or at least think I did. The auxilliary input for the I-pod works on the front speaker also.
There are four different speaker power wires, and four different grounds. When I put a test light to them, they show power at both the power wire and the ground wire. The two wires to the in-dash speaker do also - and that is the speaker that works.
On the rear speaker, the test light shows power to both power wire and ground, and even if I try a pair of other speakers I have, none of them will work even if the wires are reversed. I understand that stereo manufacturers have you return the ground to the head unit, as I am doing.
Getting a little frustrating, and the in-dash speaker that works isn't so crisp, but it does function. Any suggestions on how to make any of these rear speakers work?
