How to trace battery drain....

[tsb09000]

So my 03 tahoe has been draining down overnight and I can't find out what's causing it. I've tried this method but haven't gotten to #7 yet.

Is there anything I should check that's common on these trucks or another way of testing? Just any advice at all? The battery is brand new and the alternator checks out fine...

Thanks!

 

[vatahoelt]

could hook up a voltmeter inline with battery and then start pulling fuses to see which one causes a fluctuation in the meter's reading.

 

[tsb09000]

I found that the positive side connection was stripped so I switched both to the top mount and so far (knock on wood) I haven't had another problem. Could that have been the cause all along?? One other question, every time I hook the battery back up it arcs, is that normal? What's staying on to cause that?

 

[BlizzardX23]

Your talking about hooking the terminals back to the battery? Yes...it is supposed to arc...(very small amount)

 

[dropmech]

Check the starter-to-ground connections. I had a battery draining on me because the grounding point for that cable was corroded to hell.