Hi there. My 2005 Silverado truck's battery keeps running out of energy. My battery seemed weak so I had it tested and replaced. Alternator was also tested by two different mechanics and is putting out a good charge. Several times now I have tried to start my truck and the battery (new one) is dead. It was tested as good and even replaced again with a new one.

It was suggested that there is something draining the battery. I had a shop look into it and they could not find anything that might be draining the battery.

I have verified that no lights were left on, no doors ajar.

Has anyone else had this issue? Where might I look/do to find the issue? I can't keep finding that my battery is dead when I need to get somewhere.

Thanks so much in advance.

 

I’m having the same issue with my 02 Silverado 1500. Watched some YouTube’s on finding the drain, mine is draining through the TBC fuse under the hood, it’s the power supply for the BCM. I haven’t yet located the system that’s draining though, I’m pretty sure my issue is in the brown plug on the BCM, but I’m still searching for guidance on how to test the wires, ie. how much resistance there should be, voltage, or which ones besides the grounds should go to ground? Any help is appreciated.

 

There could be a problem with all the modules shutting down after the vehicle is shut down. This can take around 45 minutes to an hour.
There is a special procedure for finding what is called "parasitic drains" and you might want to check a few videos on the right way to find the problem.
You have the meter , I believe, all you need now is the right method to locate the source of the drain.

 

I'm having the same issues with my 2005 suburban. I hooked the multimeter on the negative side of the battery and set the meter on 10 amps. You have to have one side on the battery terminal and the other connected to the negative cable. My draw was .18 where its supposed to be around .05. I didn't check it hour later, but I will now. I went to amazon and installed a knife switch on the negative side of the battery. I only use the truck every couple of days so when I get home I pop the hood open and move the knife switch. I don't really need the radio station presets. It sounds like a pain, but I don't like the fact that the system is always draining my battery. My last costco interstate battery only last 2 1/2 years. I use a desulfator on the vehicles we have and I try to keep the batteries above 12.4 volts so they don't start to sulfate.

 

A certified Inspector will instruct you this: you have a FUSE PANEL. Use it to your advantage.

Pull fuses to find out which "BRANCH" the leak is on.

Use your electrical diagrams. Do NOT "throw parts". (do not replace things "that might be bad"). Test any parts that "you must know - due to diagram" on the bench with (12V or whatever).

Throwing parts always ends up costing tons of money and waste and: TAKES LONGER.

 

I know this is an old thread but I'm new here and have been going back reading old posts.

I have something on my 2003 Silverado that prevents any power drainage and it's also works as a kill switch and thief deterrent with a remote control key fob. It's a Battery Brain. It won't fix your problem but it will keep it where you can drive your vehicle until you do find the problem.

Anytime I park my truck I click the remote and it disconnects the battery. The only thing that needs to be reset when I click it back on is the clock. All the other stuff including the radio doesn't need to be reset. They make a jumper wire to prevent resetting anything but that just defeats the purpose of having a kill switch as it could still run the battery down if you have a drainage problem with it hooked up.

I don't drive my truck very much so it sits for long periods of time and I like being able to disconnect the battery without having to do anything except click the remote. I keep a battery maintainer hooked to the battery when it's going to be parked for any length of time. It won't over charge the battery like a trickle charger will.

I've been using a Battery Brain since 2007 without any problems. The first unit I had was the platinum model that required a motion sensor hooked to it so it couldn't disconnect while the engine was still running. Then they came out with this newer model that I purchased 5 years ago that has the motion sensor built in.

 

Do you have a link for the "device"?

 

Summit racing sells them and quite a few other places on the internet. Just go to Summit and type in Battery Brain.

 

Thanks!