I have replaced the batt with a cold start 600, and I have had to replace the alt. for the last 2 years. I ran a test on the charging system and found that when I pulled all the fuses and checked each circuit as i re installed the fuses that when I installed the fuse to the batt. and then put the stereo (batt.) wire in I got a short. I re checked my wires and they all seem good. I have added a electric fan but again thats not a lot. it just seems when I unhook the stereo alls seems good, good charging, lights bright etc. but once I kick in the stereo my alt. gauge starts to go eratic.