clicking noise

while i was driving yesterday my car started to make a strange clicking noise under the passanger side of the dash. earlier that day i had stopped by a sears auto center where a friend works and hooked the car up to their battery diagnostic and ran my system almost full volume for about 30 seconds. i noticed the voltage never dropped under 12 and the amperage draw stayed around 80-90 at the highest. i stopped at in and out and then drove the car home, the clicking started right as i was pulling in my driveway, the radio went on and off a bunch and lights on the dash went crazy. i have a redtop, kicker 1/0 a sundown 1500 and a re sx 15 (dual 2). it's in a 1995 accord 2.2 4 cyl with a 90 amp alternator. my gains were set by the shop that built my enclosure and i haven't noticed any heat or clipping problems. anyone know what this might be? (the alternators on the driver side of the engine bay, and this was definitely coming from under the passanger side dashboard.)