Mystery Battery Draw While Parked UPDATE
Update 13 Jan-- ----------- Never know--somebody on here might have an idea what to look for, thanks for any help. 2003 Chev 2500HD LT (so has lots of electrical stuff that works with ignition...
Forum Discussion
.74 amps is really high. No wonder your battery dies. My 2009 Suburban has the same problem. The battery would be dead in about 3 days if you didn't drive it. I tried putting my meter in line with the negative and pulling fuses. I could never really get anything to make sense.
When you pull certain fuses and then put them back in it causes the stupid build in "security" function to activate blinking the lights and blaring the horn. This would pull more than my 10 amp DC meter could handle and blow it's fuse so watch out for that.
I got fed up and took it to a mechanic. He had it for several days in his shop with a charger on the battery and his meters on various things. He determined that the rear wiper was partly to blame. I had him just unhook it since I rarely use it. He eventually determined the BCM was waking itself up at random when it shouldn't be and causing all sorts of problems. They replaced the BCM. The whole thing cost me about $1,000. Now the battery will last about 7 to 9 days before dying. That's a tremendous improvement but obviously still not quite right. I'm dong throwing time and money at it. Otherwise it's a great vehicle that I like.
My plan is to get a small battery maintainer and mount it under the hood with the cord hanging out the grill like a diesel. I'll just plug it in if I'm not going to drive it.
When you pull certain fuses and then put them back in it causes the stupid build in "security" function to activate blinking the lights and blaring the horn. This would pull more than my 10 amp DC meter could handle and blow it's fuse so watch out for that.
I got fed up and took it to a mechanic. He had it for several days in his shop with a charger on the battery and his meters on various things. He determined that the rear wiper was partly to blame. I had him just unhook it since I rarely use it. He eventually determined the BCM was waking itself up at random when it shouldn't be and causing all sorts of problems. They replaced the BCM. The whole thing cost me about $1,000. Now the battery will last about 7 to 9 days before dying. That's a tremendous improvement but obviously still not quite right. I'm dong throwing time and money at it. Otherwise it's a great vehicle that I like.
My plan is to get a small battery maintainer and mount it under the hood with the cord hanging out the grill like a diesel. I'll just plug it in if I'm not going to drive it.
