Faders were fine. I tried putting it to full rear as a test and it seemed to still come out the front, if a bit quieter.
I'll mess about with it a bit at the weekend. Battery got disconnected recently. Maybe that needs to happen again.
That's odd! Set to full rear should have had no sound if rears were dead! Yeah maybe try disconnecting negative terminal for at least half an hour, but very surprised if that makes a difference. Maybe the internals of the radio amp have got fried!
Though I have come across devices with faders where full front/rear doesn't result in the other set being totally mute - but they are severely attenuated (not just a bit quieter). Other than that - what he said! Esp. if nothing else has been done that could possibly effect it.
Of course you could check the wiring and because both rears are affected at once I would be inclined to do so at the head-unit end - could measure speaker impedance, speaker/cable to GND faults, etc.. Might be a connection issue (sought of doubt it though), and (of course) you might want to check the 'grounding' (improper ground has seemingly caused some weird issues before).
I hope it isn't as Dazzler bought up... the internals of the amp being fried... of course that could be an excuse to fit a nice aftermarket unit if budget allows.
