I went to the gas station to get some coors light. when i come out to start the heep. it acts kind of funny (my stereo was reset as if i disconnected battery). i go to Burger king, and cut it off in the drivethru- starts fine. on the way home i was bassing out ( lightning cap, 1000w amp, 3 10's) with the heater fan on high. the alt. gauge started dipping way low with every bass. and the head lights were getting unusaully dim. i got home, turned it off, and when i hit the lock button, the interior lights dimmed up. so im like great, no juice on the battery. try to start it, and click the battery is dead. am i right on assuming its a bad alt? then only thing making the guage jump down was the stereo, other than that it was reading on the mid line.. its the original 125,000 on it. starter just went last week. thanks guys. the battery is 3 years old- the best napa one... i appreciate it