I have a 95 celica gt conv. and I just recently had a sound system installed. Well to say the least they did a crappy job and I was pissed. So the next day my bro goes to have them check the wiring out. On his way over there the car alarm comes on and it shuts the car down.To make a long story short the tech from the place comes checks it out and unplugs the little black box from under the seat.Well we found out that it burnt a 30 amp fuse under the hood.So we replaced it and it worked for a few days and it did it again. right now its sitting in my drive way because it won't let me start it up. it keeps buring that 30 amp fuse and it only started doing this after I had the sound system installed,so I don't know if its their screwed up wiring or a freak thing. If anyone has any info about this post please.