Fader Question

[Jmana]

I am having a very hard time getting the front speakers to work in my 87 300D. I have cleaned out the fader switch, and checked the wiring going to the speakers. I don't think it can be an amp problem, because from what I've been told there are two amps, one for the right front and back, and one for the left front and back. So, where else could the problem be? I am tired of listening to just the rear speakers. I am tempted to pull everything out and start from scratch.