What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Life_Of_TC]

Put on my roof rack, new seat covers so the sex trophies don’t destroy my leather seats, and replaced my radiator since the old one was leaking.

 

[pwtr02ss]

Thanks man, fo-sho. Buc-ee’s didn’t disappoint with breakfast food or merch. But the ethanol-free was 87. No bueno for the Denali.

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Crossed a nice milestone on I-64 on the way home.

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You have to go to the next pump up (forward) to get the 90. They stopped doing the 93. Bastards. I have to put 93 in the avalanche and the Denali. Back to e10 for me after they switched

 

[gooffeyguy]

I have to figure out what's going on with my battery, I've had to use a booster twice on it. It's sat for about 2 days between each time and has enough juice in it to power the locks and everything like normal when getting in, but just can't quite crank.

The battery is about 3-4 years old. I always turn off the dash cam when parked at home. I also have the AutoSync plugged in under the dash using a splitter and have a OBDLink MX+ Bluetooth dongle plugged in. The MX+ usually powers down after a few minutes and the AutoSync isn't powered up when ignition is off.

I've had these for a couple years and never had this problem, unless one of these devices did a firmware update and has a bug in it causing it not to power down. I've unplugged the MX+ and gonna see if it goes dead again

 

[Geotrash]

I have to figure out what's going on with my battery, I've had to use a booster twice on it. It's sat for about 2 days between each time and has enough juice in it to power the locks and everything like normal when getting in, but just can't quite crank.

The battery is about 3-4 years old. I always turn off the dash cam when parked at home. I also have the AutoSync plugged in under the dash using a splitter and have a OBDLink MX+ Bluetooth dongle plugged in. The MX+ usually powers down after a few minutes and the AutoSync isn't powered up when ignition is off.

I've had these for a couple years and never had this problem, unless one of these devices did a firmware update and has a bug in it causing it not to power down. I've unplugged the MX+ and gonna see if it goes dead again

Good process of narrowing down any parasitic drains from the stuff you've added.

I've had some mixed results with AGM batteries behaving in exactly the same way in older vehicles. Most recently in our '05 Infiniti G35X. It acted EXACTLY like there was a parasitic drain, and the AGM battery was maybe 18 months old, IIRC. It would go dead within 48 hours and I spent a ton of time trying to find parasitic drains. Swapped it with the cheapest Autozone conventional battery I could find, and now it often sits for 2-3 weeks without being driven, no problem at all.

One theory I have is that the factory alternators on our trucks (and most pre-2015 cars) don't charge AGM batteries in the way that they need to be charged for longevity. It's purely a theory, but when I replaced the alternators in both of mine with new Chinese units and new AGM batteries, I haven't had a problem since and it's been 4 years on one of them now. Prior to that they both ate new, expensive, German AGM batteries within a year.

 

[gooffeyguy]

This is just a standard type battery. I've never had problems before, even with it sitting a week. The two times this happened this week, I drove it to run a couple errands and shut it off to go inside the store or to get gas and it started fine. I have it pulled into the garage now and am going to look it over and connect that new charger/booster/Maintainer I recently got and see what it does. I did use that to boost it this morning using the 100a start setting.

 

[Life_Of_TC]

Got the new K and N intake on the ‘Hoe!

 

[Doubeleive]

Got the new K and N intake on the ‘Hoe!

blackhawk? they don't stamp them anymore?

 

[FasterBass]

Finally installed my new Moog front diff mounts, will have to see if this fixes the clunking! Next on the list is trans mount, and then all the various control arms in the rear. Then sell the F@$%#&* thing if I can't get it to stop clunking.

 

[gooffeyguy]

Good process of narrowing down any parasitic drains from the stuff you've added.

I've had some mixed results with AGM batteries behaving in exactly the same way in older vehicles. Most recently in our '05 Infiniti G35X. It acted EXACTLY like there was a parasitic drain, and the AGM battery was maybe 18 months old, IIRC. It would go dead within 48 hours and I spent a ton of time trying to find parasitic drains. Swapped it with the cheapest Autozone conventional battery I could find, and now it often sits for 2-3 weeks without being driven, no problem at all.

One theory I have is that the factory alternators on our trucks (and most pre-2015 cars) don't charge AGM batteries in the way that they need to be charged for longevity. It's purely a theory, but when I replaced the alternators in both of mine with new Chinese units and new AGM batteries, I haven't had a problem since and it's been 4 years on one of them now. Prior to that they both ate new, expensive, German AGM batteries within a year.

So I looked at the battery and the date code on it is 11/19 so it's only been just over 3 years. It has a 3 year warranty (Everstart Maxx from Walmart).

When I first hooked the charger/conditioner to it, it said the voltage was 11.1v. I started the charge cycle and the percentage started at 0% and was at 1% in a few minutes. I stepped away for about 15 mins and when I got back it was at 100% and in maintain mode.

It started fine and while idling with the Tech2 hooked up it showed ignition voltage at 14.28 or 14.58, I can't remember. So the charge circuit seems fine. I need to go check the standing voltage now that it's been sitting for about 2 hours

 

[Fless]

So I looked at the battery and the date code on it is 11/19 so it's only been just over 3 years. It has a 3 year warranty (Everstart Maxx from Walmart).

When I first hooked the charger/conditioner to it, it said the voltage was 11.1v. I started the charge cycle and the percentage started at 0% and was at 1% in a few minutes. I stepped away for about 15 mins and when I got back it was at 100% and in maintain mode.

It started fine and while idling with the Tech2 hooked up it showed ignition voltage at 14.28 or 14.58, I can't remember. So the charge circuit seems fine. I need to go check the standing voltage now that it's been sitting for about 2 hours

Sounds like it's not accepting a full charge since it comes up so quickly. Might try a desulfate cycle if your charger will do that.