Good Sam Club Open Roads Forum: Mystery Battery Draw While Parked UPDATE
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 > Mystery Battery Draw While Parked UPDATE

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Grit dog

Black Diamond, WA

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Posted: 01/10/22 12:56pm Link  |  Quote  |  Print  |  Notify Moderator

jdc1 wrote:

BC is VERY cold. Would the severe cold weather be doing it? Loads? Memory in computers and radio. Do you have an alarm you turn on? That's another parasitic load.


Yeah, Victoria is in the +40s every day and night in the current forecast, you know sea level, right on the water....And the OP said it's raining out...


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Grit dog

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Posted: 01/10/22 12:59pm Link  |  Quote  |  Print  |  Notify Moderator

BobsYourUncle wrote:

Don't rule out the alternator.

While it may appear fine, charge well etc, a bad diode in the rectifier bridge can cause an undetectable "leakage".

I had that once in an old car. The battery would run flat after sitting a few days. I had a dickens of a time figuring it out until I disconnected the alternator and found no drain with it unplugged, and the main battery wire removed. Took it apart, replaced the rectifier assembly - end of problem.


^This is worth checking out. Or rodent damage?

KD4UPL

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Posted: 01/10/22 04:17pm Link  |  Quote  |  Print  |  Notify Moderator

.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.

Thunderbolt

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Posted: 01/11/22 06:29am Link  |  Quote  |  Print  |  Notify Moderator

Back when my brother had his 03 Silverado he had a similar issue and the dealer eventually found that it was the instrument cluster and once they replaced it the problem was solved. Not saying that is the problem with yours, but it is a possibility.


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2003silverado

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Posted: 01/11/22 06:33am Link  |  Quote  |  Print  |  Notify Moderator

Ron Ananian the car doctor was once talking about a bad switch on a lighted glove compartment door wouldn't turn the light off when the glove compartment was closed.

Groover

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Posted: 01/11/22 07:35am Link  |  Quote  |  Print  |  Notify Moderator

One of my most puzzling problems was a Ford Taurus with a battery drain. I eventually took it to a dealer and they announced that it was a bad battery and replaced the one it. That battery was fairly new and I did not buy that story so I demanded the old one back. I took it home and put in my 1991 F250 with a motor 2 1/2 times as big. The batter did fine in that truck and was still in it 3 later when I sold it. The Taurus was also doing fine with the Ford battery.

Obviously the old batter was good and just as obviously putting a new battery in the Taurus fixed it. I have no explanation for that.

JRscooby

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Posted: 01/11/22 08:09am Link  |  Quote  |  Print  |  Notify Moderator

Ed_Gee wrote:

It may be tedious but I'd start removing fuses, one at a time, check current draw after each fuse removed ... reinstall the removed fuse and move on.


I have a 1156 lamp that I can clip in place between batt post and the disconnected cable. Watch lamp as you pull/replace fuses.

BFL13

Victoria, BC

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Posted: 01/11/22 09:24am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all the ideas! I can get back to it on Thursday according to the weatherman.

Meanwhile it has been bothering me that the 0.74 amp draw at 18AH a day does not match the daily voltage decline. After three days it is 12.4 and 54AH would have a 100AH battery at 12.1. I don't know the AH of a starting battery, but expect it is more like 50AH --not a clue, so it really ought to be flat dead perhaps. Something not right there.

So it is likely the 0.74 amps is not 24/7. It was mentioned earlier that there is a time lag for everything to shut down so the real draw must be less than that 0.74 to match the voltage decline.

I note that taking the neg cable off the batt to do the amps measurement causes the truck's brain to need a reset for some things once reconnected. Inserting the meter reconnects the brain so it might draw more just then while it recovers its mind.

Gremlins galore in the replies! No way I am letting a garage go gremlin hunting at $100/hr, so if I don't find it, I will live with it and plug in the battery maintainer at home. Off-grid camping more than a few days will need attention--steal from the camper or run the truck engine before it gets down too far.

Anyway, have to wait to get back at it. Thanks everyone for the interest. I will report back when I find out more.


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Dick_B

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Posted: 01/11/22 10:19am Link  |  Quote  |  Print  |  Notify Moderator

We had a low draw from our GPS and camera that we plugged into our 12V socket. When it was cold it was enough to drain down the battery so I had to jump start it. We now try to remember to unplug both overnight.


Dick_B
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ktmrfs

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Posted: 01/11/22 03:53pm Link  |  Quote  |  Print  |  Notify Moderator

we had a 2004 Silverado. couple of other things to check
1) make sure ALL the interior lights are off. It's amazingly easy to accidentally turn on one of the front or rear overhead lights and not realize it.
2) IIRC not all the 12V outlets turn off with ignition so make sure you don't have anything plugged into the outlets
3) Double check that the visor lights are off. Again, another easy one to accidentally leave on.

Once the Silverado goes into full sleep mode, current draw should be in the few 10's of milliamp range IIRC. But on initial shutoff it can be 1/2 to 1 A.

Lastly, on the diesel, the battery power to the trailer plugs is ALWAYS on, even with ignition off. I don't know if that is the case on the gas or not, and it may depend if you have the one battery or two battery option on the gas engine. So if you have anything hooked to the trailer plug, I'd disconnect and see if the problem goes away.


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2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!


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