Did my best not to become a Darwin recipient and pushed it back a little myself. The bats showed 10v on my meter. Jumped it off the wife's car. Just surprised to see these batteries go so soon.

Sent from my SM-G950U using Tapatalk

 

I would recommend testing your charging system and performing a parasitic draw test on the truck to look for unknown power consumption. Your batteries may be bad, or they may have a high parasitic load on them which is slowly killing them.

Edit: the LML trucks charging system is a variable voltage charging system. Your alternator will not necessarily output 14.4 volts as with the older systems. This does not mean it is bad, that guide is geared more towards the older trucks in that regard.

Edit 2: the batteries in my 15.5 were toast when i bought it, they dropped under 10V cranking the truck warm, so its also totally in the realm of possibilities that GM is just putting crap batteries in these days. Theres people on here who know more about the battery industry who could probably answer that question.

 

As new vehicles are produced with EVERYTHING being electronic these days. It seems batteries only last 3 to 4 years maximum. They do not last the 6 years they used to at all. IMHO

 

a big part of that is maintenance. the older trucks were a lot more accepting of an iffy battery than the new ones are. Things like battery blankets / heaters, cleaning the case off, and trickle charging when not in use will extend the life of the battery a good bit. That said, if you live somewhere like arizona, just accept that your going destroy batteries every other year due to temperature. Heat really kills them, but aside from that, if you treat them right they will last a long time.

 

Disconnected the neg on both had them tested after a short drive. Showed 12.2 on both. Been driving around for a while now and watching my voltage on the Edge. Charging system seems fine. Lost my outside temp in this process somehow. Just dashes there.

I'm wondering if need to just get a couple batteries.

Sent from my SM-G950U using Tapatalk

 

pull them and have them load tested. If they pass, charge them and keep going, if they dont, replace them. Load testing is really your end all answer the the question of if they are good or not.

 

Had them load tested at AutoZone. They said they we're good and didn't try to sell me anything, so we'll see what happens. If it drains again next time I go to work(7 days) I'll change batteries. If it does again after that, off to the dealer.

Sent from my SM-G950U using Tapatalk

 

your batteries test good and your meter tells you that they were dead, you should really do a parasitic draw test at this point to see if there is a problem. as little as a 150 ma parasitic draw (a stuck relay for example) can seriously drain a set of batteries over night. replacing batteries and taking it to the dealer for diagnosis would be really costly for what could potentially be a 12$ relay. the test will take less than an hour and your touch time on the trucks maybe 10 minutes.

 

My 15 did the same thing about a year ago around 48,000 miles. Only difference is truck sat for 24 hours. Had the batteries load tested and about a year later and 16,000 miles later, not a single issue. Still on original batteries.

 

Last night, where we camped it got down in the 20's so a good test of the batts. It started this morning, but edge showed 11.7 after the start. I never looked at voltage in the past so not sure if it's normal after a cold start. I'd never pulled the codes from the first instance, so I did that this morning too.

P2510. Something about a start relay.

P262B. Probably from when I disconnected the batteries for testing.

If I get bored around the campsite today I'll do a draw test on it. Thanks for all the suggestions.



Sent from my SM-G950U using Tapatalk

 

Quick follow up for anyone else who has this issue down the road.

Truck sat for six days. Started right up. No hesitation. Only thing I did different is I left my Edge monitor unplugged. So, I don't think anything is drawing power.

I have another theory. My truck just fits in the garage. I have to get in on the passenger side and slide across(cloth seats). Rediculous I know. In hind site, I got a pretty good static shock that day when I stuck my key in the ignition. Could I have pissed off something in the system with that little shock.



Sent from my SM-G950U using Tapatalk

 

Quick follow up for anyone else who has this issue down the road.

Truck sat for six days. Started right up. No hesitation. Only thing I did different is I left my Edge monitor unplugged. So, I don't think anything is drawing power.

I have another theory. My truck just fits in the garage. I have to get in on the passenger side and slide across(cloth seats). Rediculous I know. In hind site, I got a pretty good static shock that day when I stuck my key in the ignition. Could I have pissed off something in the system with that little shock.



Sent from my SM-G950U using Tapatalk

you mean besides unplugging the parasitic draw, i mean, edge monitor?

it is unlikely that static would damage the batteries or charging system, you would be more likely to damage a computer which would not match your issues.

 

Maybe you're right. Maybe it is the Edge. I've had it plugged in for a couple years without issue, but I suppose anything is possible.

Sent from my SM-G950U using Tapatalk

 

batteries get weaker over time as internal resistance creeps up, that parasitic load may have been acceptable when the batteries were new, but as they age, the same load will take a larger toll on the batteries ability to crank the truck. The easy solution would be to connect the edge to the trucks ignition wire for power instead of a hot wire, that way it turns on and off with the key.