LS 400 Wiring Problems

I talked to someone in this forum early, and they were helpful in leading me in the right direction, however, I am still having problems.  I hooked the remote turn on up and no sound comes out of the center speaker.  If I move the wires back and forth over eachother, it makes a "boom" noise, but as soon as I stop moving the wires, the noise stops.  I have no idea where to go from here.  If anyone has wired a 1990 LS 400 before and knows how to get the center speaker in the back to work, let me know.

Thanks

There is a factory installed amp, there is a blue, pink, and 4 other multi color ones.  I hooked up all the wires that i could so i not sure where to go from here. the only 1 wire that is not hooked up and that is the interrupter wire from the head unit.  Other than that everything is connected to something else.  Any suggestions?