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2005 GMC Sierra 1500 Electrical Issues
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By JeffOBS
I am looking for some detailed electrical drawings/schematics for a 1994 Silverado K1500. I have the Hayne's and Chilton's manuals but may need more information about the electrical system. I had a shop do a LS swap in my son's 94. They did a great job installing the 5.3 with the mated transmission. The motor runs great and no issues with the transmission. But there are items that are not working that were working before the swap. The shop didn't give me an upfront estimate for the swap and was billing me an hourly rate so I'm doing the rest of it myself. I have used the search bar here with limited results. I am a new member here and I'm having a hard time navigating this site. Plus, what's up with all these ads that are everywhere? Thanks in advance for your help.
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By John Crouse
Hi All.
I have got a real puzzle. The volt meter (analog) on my dash when cold reads just under the 14 volt mark. As it warms up it drops eventually to just above the red zone. I have changed out all my cables with heavy duty cables, cleaned all grounds I could find, being that both were old anyway, changed alternator and battery for top pole battery., swapped out Ecm (swapped back), and still the same. Here is the real puzzle for me. I have checked with my multimeter the continuity of the battery cables and when running, tested the volts. With multimeter everything is good to go and reads 14 volts. So guys, what do you think?
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By Matthew J M Devildog Thompson
My brake lights stopped working intermittently. Now they are permanently out. Checked the bulb, good. Checked the wire, good. What could be causing this?
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By qoconnell
This is my first post so sorry if I’m all over the place. I’ve had my 2014 Sierra slt for about two years now. I got it with 116k miles and I’m at about 174k right now. Since the day I’ve bought the truck it’s been nothing but issues. You name it, it’s happened. Four separate water leaks (sunroof, gps antenna, third brake light, and cab vents), 2 transfer case control modules, problems with the power steering going out, brakes going out at low speeds. A couple of months ago my transmission went out and it also needed various other repairs totaling over $20k. Now my park assist sensors don’t work, my rear doors don’t open from the inside and also don’t lock from the outside, reverse lights and camera don’t work, and it constantly dings at me to service my trailer brake system (seriously, it chimes at me about every two seconds as I’m going down the road, telling me to service the trailer brakes). I’ve gone through and checked every ground I can find and nothing helps. Today I went through every single fuse and relay in the truck. I found a couple of blown fuses and replaced as needed, but still no change. I’m at a loss for what to do at this point as I’m stuck with the truck after all the money I’ve sunk into it. Does anybody maybe have any solutions to any of these problems? I’m desperate for answers, anything helps.
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By Cory Warburton
After recently swapping out my alternator, my truck lights are slightly dimming repeatedly. It's especially noticeable when I turn on the dome lights. Is it a grounding issue? The alternator doesn't physically touch the metallic base at all, but seems to be grounded only via the two bolts that hold it up and in it's right place. Should I take it off and sand any metal that connects from the bolts to the alternator?
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