new here, i searched for 10 minutes or so and read a few threads to diagnose my mom's 99 4wd yukon. The problem is a couple weeks ago, her battery she's had in in it for about a year and a half, died randomly. It was under warranty, so we had it exchanged 2 weeks and 2 days ago. lol...Well this morning it wouldn't start again. Battery voltage was at 2.30 volts. Pathetic. This thing is bone stock besides an ugly ass aftermarket cd player and some speakers, just normal speakers, no subs or amps.
The starter is about a year old, long story but we replaced that ourself. The alternator is good, tested 3 times today, and it has battery voltage at idle, and runs up to 14.5 under 1500 rpm.
The grounds seem fine, I even cleaned a few back under the rear bumper for the hell of it. I can't find any shorts, and the grounds in the engine bay seem fine. Behind the passenger head, and on the block under the pulleys, passenger side.
A few things to note though, her driver side door latch broke, so I replaced it. That's the latest thing we've done so thinking maybe there was a short, possibly I pulled on a wire or one got caught up somewhere...I pulled the door panel off earlier today, and all the wiring seems fine. Then that's when I cleaned the grounds. Also, about a week ago at night when my mom had came home, her dash lights and taillights didn't work..So I pulled the fuses looking at random ones and I don't remember which, but it was blown. Replaced it and the lights came back on and worked fine.
THat's what led me to cleaning up the grounds near the taillights thinking it had a bad ground but I don't know, it could be too early to tell if that helped at all??
Also, the alternator to battery wire has no resistance so that's good, haven't checked the battery ground or the starter wire but I will I guess. Other than that, I don't really know wtf to check. The starter, battery, and alternator are all relatively new.
On my search I read something about the BCM leaving power on to something and draining the battery when the car is parked and not running? Are there any service bulletins at the GMC/Chevy dealerships for common problems with these things? I called a starter and alternator place and the guy I talked to, said one of his neighbors has a Yukon and kinda had the same issues, battery dying and what not. He said that his AC relay went bad or something?? I don't know exactly what that would have to do with the battery, but I pulled the relay out for the time being just to be safe. Any thoughts on that??
Sorry for the novel but I'm highly frustrated. I'd appreciate any help, thanks in advance!!
edit : ALSO, i forgot...the ac/heater only work on one preset, i think it's either #3 or #4 or whatever....I was told by someone once that the blower resistor or something like that gets corroded and needs replaced. Is that possibly the culprit maybe? And at the same time, possibly what the guy at the starter shop was trying to explain but couldn't remember exactly? Thanks again!
The starter is about a year old, long story but we replaced that ourself. The alternator is good, tested 3 times today, and it has battery voltage at idle, and runs up to 14.5 under 1500 rpm.
The grounds seem fine, I even cleaned a few back under the rear bumper for the hell of it. I can't find any shorts, and the grounds in the engine bay seem fine. Behind the passenger head, and on the block under the pulleys, passenger side.
A few things to note though, her driver side door latch broke, so I replaced it. That's the latest thing we've done so thinking maybe there was a short, possibly I pulled on a wire or one got caught up somewhere...I pulled the door panel off earlier today, and all the wiring seems fine. Then that's when I cleaned the grounds. Also, about a week ago at night when my mom had came home, her dash lights and taillights didn't work..So I pulled the fuses looking at random ones and I don't remember which, but it was blown. Replaced it and the lights came back on and worked fine.
THat's what led me to cleaning up the grounds near the taillights thinking it had a bad ground but I don't know, it could be too early to tell if that helped at all??
Also, the alternator to battery wire has no resistance so that's good, haven't checked the battery ground or the starter wire but I will I guess. Other than that, I don't really know wtf to check. The starter, battery, and alternator are all relatively new.
On my search I read something about the BCM leaving power on to something and draining the battery when the car is parked and not running? Are there any service bulletins at the GMC/Chevy dealerships for common problems with these things? I called a starter and alternator place and the guy I talked to, said one of his neighbors has a Yukon and kinda had the same issues, battery dying and what not. He said that his AC relay went bad or something?? I don't know exactly what that would have to do with the battery, but I pulled the relay out for the time being just to be safe. Any thoughts on that??
Sorry for the novel but I'm highly frustrated. I'd appreciate any help, thanks in advance!!
edit : ALSO, i forgot...the ac/heater only work on one preset, i think it's either #3 or #4 or whatever....I was told by someone once that the blower resistor or something like that gets corroded and needs replaced. Is that possibly the culprit maybe? And at the same time, possibly what the guy at the starter shop was trying to explain but couldn't remember exactly? Thanks again!
lol
