Hodi23

Have a question. Recently replaced my battery around the new year (died during a cold snap and it was a janky wal-mart battery that was in the truck when I bought it). Got a gold autocraft battery, no problems until the other day.
Went to leave work and wouldn't start. Got a jump and went back to advanced. Had them test the battery, alternator, and starter. No issues other than the battery was drained.
Checked all my connections, fuses, etc. No issues found. Only thing different was my rear light switch was set to door, which I always leave off as it doesn't work on door. Think I bumped it to that about a week before I started having problems w/ my first battery (pulling out stuff out of the back door during xmas). Does that have so much of a draw that it would kill a new battery in 3 weeks?
I'm currently charging the battery tonight and would like to know if I need to do more troubleshooting before this issue happens again. I have no after market accessories other than a black widow alarm system that's been there way before I started having issues w/ a pwr drain.
Thanks for your time and consideration.

sam333

One way to check for a battery drain is to remove either your positive or negitive lead off the battery and place a volt meter set to amps in series( one lead to batt post and one to cable end) to complete the circuit. You should not have much more than a 50 milliamp drain. If you do, start buy disconnecting your alternator.Try one thing at a time ( pulling fuses/ relays or systems) untill you find the drain. If you just have a test light, you can use that, it will burn brighter the larger the current draw. The easiest would be a clamp on meter
( dont have to disconnect any wires).

Hodi23

No test light, got a .30a drain when I tested the battery.

sam333

.3 amps is 300 millamps , so you do have somthing draining your battery. Try disconnecting your alternator first and go from there. Start pulling relays and fuses one at a time till you find which circuit is the problem.