02 camaro batery drains overnight with or with out alarm on. have system disconected at batery, had batery and alternater tested, both good. went to midas and had a electrical drawing diagnostic done, went fuse by fuse could not find problem. have after market alarm, i believ it might be that, even though should have been able to tell when pulling fuses. any ideas as to what i can do to track this down, or what it might be.
When you went to midas and had a electrical drawing diagnostic done, how much current did they say was being drawn?
i dont recall a number but it was a significant amount. im sure there is a number of things that can be drawing but i thought going fuse by fuse i would be able to find it... sence that didnt work, do have any ideas as to what it could be.
If as you say you pulled the alarm fuse/fuses and it still happened it can't be the alarm. Disconnect battery neg terminal, take a DMM with at least 10amps reading, place pos (red) lead to ground or removed lead and neg (black) lead to battery terminal. Reading should be 40-80milliamps on amp scale. (thousands of an amp) If reading is over 1/1.2 amps wait for dome lights to go out, then pull fuses one by one until the reading shoots down.
Set DMM to 20 volt DC scale then place terminals on battery, neg to neg and pos to pos. If battery OK, reading should be 12.6 volts. On starting engine, reading should go to 13.8/14 volts. If battery reads 12volts or less it's f*****d. If reading doesn't increase or goes to 15 volts or more, yoyur alternastor is f****d.
As a last test, leave engine idling with meter in last setting and turn EVERYTHING ELECTRICAL ON, voltage should not drop below 10-11 volts.If it does, again your battery is f*****d.