Yesterday my recently installed alarm system went dead, along with my rear lights ('tho not the brake or turn signals) and instrument lights. The fuse was blown, and when I installed another (with the lights/power off) it blew again immediately (even with a 20A fuse.) The alarm is on a different fuse which blew when the parking lights blew, since it's wired to flash the lights when it arms. I took it back to the alarm dealer and they spent almost 2 hrs cleaning up the wiring and searching for the short, but found nothing.

Any ideas/suggestions?