Battery drains overnight
 

I have a 2002 Blazer that has a constant draw on the battery. I put a new battery in it and it went dead overnight. I hooked up a multi-meter between the positive terminal and the positive cable and there was a draw of about 1.25 amps with everything off and the key out of the ignition. After letting it set for a few minutes it droped to .02 amps. I wouldn't think that would be enough draw to drain the battery overnight. Any ideas of what could be causing the battery to go dead?

Do u have a system with subs. or anything pluged in to the cig outlet. maybe your visor mirror light is staying on?

The audio system is stock and there is nothing in the cig outlets. I don't think the visor light it staying on but i will make sure.

Battery Drain- I know what you mean.
 

I have this exact same problem and have been battling it for years. I've coped by unhooking the battery every time I leave the car, recently installing an easier switch to disconnect the battery whenever I leave it. I've had mechanics swear they'll fix it but never locating a definitive source for the electrical drain after many attempts.

Of course the battery has been replaced several times, the alternator has been replaced, the Transfer Case module, even the radio has been tampered with.

I hope someone can help, but if not, my advice is to start unhooking your battery if you want to drive your car the next day.

There are a few posts that I have written describing the methods used to sort out a battery drain. You need to isolate the circuit that the drain is coming from and then determine which device on that circuit is causing this. This is not a task for impatient people to go through. It is long, tedious, and can be frustrating. You need to have a good reference manual for accurate wiring diagrams at your disposal for the whole process.

No I don't

Check the light under the hood, too.

Like swatlkk says, this can be a tedious process but you can get to the bottom of it. Do you have or can you borrow an amp clamp meter? First thing is to verify that you have “vampire” power measured at the main battery cable draining the battery with everything turned off. If so then you can pull the fuses one by one until you locate the offending circuit, then go from there.

George

I had this problem
 

I had the battery drain problem as well about 3 years ago on my '98. I had nothing plugged in and everything on the truck was stock. Pulled my hair out for months chasing a parasitic draw.

I discovered that I had a faulty ignition cylinder. It felt like the ignition was off, and you could pull the key out and everything. It really wasn't off though and was draining the battery. I discovered this one day when I was driving one day and for some reason I reached up and pulled the key out of the ignition cylinder.

I replaced the cylinder and have not had the problem since

Maybe not your issue but something to check

Hope this helps
Regards
Don

Closing a 9+ year old thread... Deborah Smith can create a new thread if help is needed, hopefully with a LOT more detail.

*Thread Closed*