I'm with Alan H on this, I think the stereo/amp setup probably does not have much of an impact on the situation, except that maybe something got cross wired during the installation.

I would certainly try the hazard switch, and see if that blows a fuse also, because that would effectivly rule out the turn signal switch as your problem.

If the right turn signal doesn't blow the fuse, it's probably not the blinker selenoid either, which would suggest that the problem lies somewhere between your blinker selenoid and the light fixture itself.

good luck
Erik <img src="/forums/images/graemlins/cheers.gif" alt="" />