Battery drain

[56kz2slow]

So, get up one day after a snow storm to move my truck, battery dead on my 2015 Sierra Base.  Original battery, didn't think much of it, boosted it, went and bought a new battery.
Next day, new battery is dead again.

Brought it to my local mechanic to troubleshoot the draw.  He was noticing a 0.5V drop in 9 hours one day, then dead the following day.  Charged again, looked at it at night, the heater controls were lit up, another time the instrument cluster warning lights all lit up. He also saw the dome light turn on by themselves.  Prior to that, I had other intermittent issues:
- unlock the door with the key, pushed the unlock button on the door, it would not unlock the others, start the engine, then I can unlock with the door button 
- parking brake light on the dash doesn't come on parking brake applied

- would crank for 10 to 15 seconds on cold mornings before starting

Spoke to another mechanic I know, he said the fuse box was the issue, he replaced 4 in the last couple of years.  I got it replaced by my mechanic and brought the truck home. 

I opened up the old box to see what was going on inside, it was a real mess, all corroded to ******, so pretty confident that was the issue. It's so prevalent that the local dealer keeps them in stock.

 

[JimCost2014]

4 hours ago, 56kz2slow said:

So, get up one day after a snow storm to move my truck, battery dead on my 2015 Sierra Base.  Original battery, didn't think much of it, boosted it, went and bought a new battery.
Next day, new battery is dead again.

Brought it to my local mechanic to troubleshoot the draw.  He was noticing a 0.5V drop in 9 hours one day, then dead the following day.  Charged again, looked at it at night, the heater controls were lit up, another time the instrument cluster warning lights all lit up. He also saw the dome light turn on by themselves.  Prior to that, I had other intermittent issues:
- unlock the door with the key, pushed the unlock button on the door, it would not unlock the others, start the engine, then I can unlock with the door button 
- parking brake light on the dash doesn't come on parking brake applied

- would crank for 10 to 15 seconds on cold mornings before starting

Spoke to another mechanic I know, he said the fuse box was the issue, he replaced 4 in the last couple of years.  I got it replaced by my mechanic and brought the truck home. 

I opened up the old box to see what was going on inside, it was a real mess, all corroded to ******, so pretty confident that was the issue. It's so prevalent that the local dealer keeps them in stock.

 

Good to know, does the mechanic know where the water/moisture intrusion is coming from? 

[56kz2slow]

5 hours ago, JimCost2014 said:

Good to know, does the mechanic know where the water/moisture intrusion is coming from? 

Well, it's a known problem, the other mechanic I called replaced 4 and he just works up in the garage behind his house between odd jobs.  GM refused to recall it or acknowlodge the problem, but they are selling the for 300$ (cost) instead of the 1000$ they were charging before.

In addition to that, in the case of mine, it looks like the fuse cover may have not been shut properly at some point (bought used) judging by how dirty it was under neat there.  Looking at the cover itself (no pics), the rubber gasket had a bump in one spot, so maybe it didn't seal properly. I'm going to put silicone o-ring lube on the new gasket to make sure it remains flexible and seals properly.

[Mysteryjonz]

Had an issue with alternator randomly losing the battle to charge the battery. Had to have it jumped one time, but it would go into the danger zone and then randomly pop back into charging mode. Happened again on a Friday on a 100 mile drive from home. About 30 miles out it started happening, I did make it but had gone into "charging system not working" mode. I decided on a whim to start the truck and open the hood. Had a wrench in the truck an used it to bang some of the salt and dust from it, nothing happened. I decided to move wiring harness over to get a better position to take it off and low and behold the truck started charging. Went into my gig and 5 hours later came out (25/F) and it started like a champ. Time to replace the harness.