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Good morning, I'm having some strange issues with my 2015 XL SLT that I'm trying to see if anyone else has experienced. The issue that I'm experiencing is both an intermittent right headlight failure warning and an intermittent windshield wiper failure (inoperable). I would like to start with the headlight issue: when the warning light comes on, the interior signal indicator blinks fast, however, when you go outside both lights in the front and rear are operating as normal. This problem seemingly only occurs below 32 degrees Fahrenheit and when driving in the snow/ice. The warning light will go out and be fine for days and even weeks and then come back. This originally led me to believe that there was an issue in the wiring because when this happened it also affected the mirror turn signal. Secondly, about a week or so after this started, I got into my vehicle and my windshield wipers wouldn't work. I took it to a trusted family mechanic, as I didn't have time to fiddle with it, and he changed the windshield wiper assembly. We came to that conclusion after the mechanic hooked up his computer to override the turn signal and wiper control stalk and he also couldn't operate the wipers. We were both under the impression that this was the issue. I got back into the vehicle following the assembly replacement and the wipers didn't work. We checked the part and the dealership we purchased it from and it was not the assembly. I ended up needed to drive the truck and upon driving it the wipers started working again but went back out again This issue ALSO only happens when the temperatures drop below 25 degrees Fahrenheit it seems. This is where I'm at now and why I'm hoping for some advice/second opinion. The mechanic believes that my fuse box is faulty, however, when we took the fuse box out there is no corrosion. We looked up the wiring schematics and it turns out that GM unfortunately hard wired the wiper relay into the board that's on the fuse box and they are known to go bad but there's no way to really see if it is bad. The only solution is to replace the fuse box itself but the part new is $500 and once the box is opened (if it turns out to not be the fuse box) the parts store/dealership will not let us return it. Has anyone else had this issue before? Are we looking in the right spot? I apologize for the lengthy post but if I don't have to spend $500 on this fuse box I really don't want to. Used was also not an option due to not being able to find a tested unit and additionally when finding a tested unit it was also not able to be returned. Thank you for reading this and for any advice that can be provided. TLDR; intermittent wiper and right turn signal inoperability issue. Mechanic believes issue is $500 fuse box but we can't prove it. Wanting second opinion from masses.

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.

Hi all. Long story short, I wired up my CB and dashcam to an open fuse in the drivers-side fuse block, and fried the whole thing. (Really!) Cost me a good bit to get it replaced. The dealer said I was drawing too much to tap in to there, and I should go to the engine fuse block instead. I've tested all the open ones on my truck (an LT) and didn't find anything with power with the key on. Does anyone know if any of the full ones are safe to pull? Or how are other doing it? Thanks in advance!

Okay so does anyone have an idea how to fix my fuse box? The problem is I'm missing the internal connectors to plug the fuses into. Its my two power fuses, someone must've ripped them out to hard.