my installer said the same type of crap. I ended up teaching myself all about car electronics and rewired it myself. I'd first check the ground, make sure its very very short, and good thick cable. And make sure that it is attached to bare metal. If they used the body or a seat bolt or something, go ahead and sand down the metal where it attaches.

Then make sure all the wires are seperated. My installer had the power on the opposite side, but ran all the other wires together. If the wires do ahve to be run together, cross them perpindicular, not parallel.

If you want pics or any other info, let me know.