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So I need some easy electrical help. I have not been able to get my brake lights or my windshield wipers to work after the install of the 5.3. I have rear night lights and headlights. The fuses are all good. What is the easy fix to this? I know I am missing something simple like a ground wire.
My build thread with detailed info and pics if this helps answer any questions.
http://www.ls1truck.com/forums/lsx-t...ap-thread.html
I had a problem on my 94 with intermittent wipers, it turned out to be a broken wire on one of the 2 groundsthat went on the front of the intake. Could be worth looking at.
Definitely a ground somewhere.
i know this is a dumb question but im assuming they were working before correct? it could be a ground problem but what gets me is that you say your parking lights are working..... well there is only one ground that is used for all the rear lights so if your parking lights are working, then the ground is just fine. you didnt mention if your blinkers are working or not. if they DO NOT work, then then i would assume power is not getting back there since they share the same wire as the brake lights and i would re check all fuses including the ones in the cab on the driver side dash. If your blinkers DO work, then im betting your brake relay isnt getting power or is busted or you got wires reversed on the TCC switch when you tapped into it...
im betting your having two seperate issues. it doesnt sound like a ground problem to me. let me know.
Yes the brake lights and wipers were working before. The wipers had the intermittant problem where they would turn on and not turn off right away, but they worked.
I just confirmed this morning that the following DOES WORK:
Night driving lights
Reverse Lights
Turn Signals
Brake lights DO NOT work. Third brake light also does not work but I don't remember if it worked before.
Before the swap my brake lights stopped working due to the circuit board behine the steering wheel. I replaced that circuit board and wiring harness and the brake switch on the brake pedel which fixed the problem then, so those parts are new. There is a wire somewhere that I did not hook back up is what I am thinking. Does anyone have any pictures of where in the engine bay the ground wires are and the relay? I rewired the grounds on the intake so they should be good.
I don't have a pic, but there is a thick ground that went on the back of the pass. Head, then two on the front of the intake, mine had one on an intake stud and the other was on the t-stat bolt
also make sure you dont have a blown bulb.
well im not sure why you would have had to mess with the brake wires.... unless you removed the old fuse box and are just using the new one... is that the case??? if not and your still using the old fuse block... then i got a few pics that may help. you can see the upper relay is for your brakes. IIRC this aslo goes to your third brake light.... so either this relay is not getting signal from your brake pedal OR there is no power at the relay to power the lights OR the relay coincidentally went bad but i doubt that. you got a loose power wire somewhere.http://i18.photobucket.com/albums/b1...-20-27_236.jpg
the blue wire that has the shrink tube over it is what comes from the relay and goes to the turn/hazard switch and then to the brake lights.
http://i18.photobucket.com/albums/b1...-20-57_473.jpg
OOOOORRRRR, LOL, The 1st fuse is bad. this is the one i was talking about on the dash. im sure you checked it but just saying just in case.
http://i18.photobucket.com/albums/b1...-22-23_236.jpg
http://i18.photobucket.com/albums/b1...-22-37_132.jpg
Awesome pics, I will check this morning when I get off of work. I checked the fuses and all were good and the bulbs are good as they are only 1 year old and were working great the day before the swap.
oh and i forgot to mention the windshield wipers. you said they have an intermitent type of problem as did i. i thought the blinker/wiper lever switch was going bad and i was going to replace it (which is still a possibility for you) but i googled around before i swapped it and found that this is a common problem on the OBS trucks. i guess whoever manufactured the circuit board the goes on the wiper motor did a crappy solder job and the connections come loose. you can try to resolder but i just picked up a replacement at autozone which is like MAYBE 20 bucks. to me thats better than wasting time with the soldering iron especially since the boards have updated parts on them too. ill see if i can snap a pic of mine (newer one) later. i would try that first i bet thats where your problem lies.
here you go. just take the 3 T20 torx screws off and your in. easy swap
http://i18.photobucket.com/albums/b1...-28-43_922.jpg
http://i18.photobucket.com/albums/b1...-39-52_714.jpg
Awesome thanks for the great info and pictures. It has been raining all day so I have to push off working on it for a day or so. I will tear into it probably tomorrow night.
wso whatever happened with this?
I tried to do some work on it yesterday. I have been flooded with work. I saw online that the relay on the firewall gets its power from off of the ignition source. I was trying to figure the wires out and wasn't able to figure it out yet. My fuse box is different than the pictures you posted Kewljay, I'm guessing the 1994 is different. I will try again on it tomorrow and let you all know the results.
Had same issue ran a ground from wiper housing to the bolt on the brake relay above the brake booster my wipers and brake lights worked after that. I test all grounds and hot wires they where all good didn't make since but worked.
Hello everyone,
So i just got done replacing my 4l60E transmission and I am having the same problem with my late 93 Silverado k1500 5.7L. My turn signals, run lights, hazards, and reverse lights all work. but when I have the truck off I can press the brake and the lights turn on but as soon as I turn the ignition on they stop working. but also right after when the ignition is off and press the brake the fan speed display will light up. so if I let the truck set with ignition off for a minute or less it will start working again also the fuse for the park lamps was melted there was a 25 amp instead of a 20 amp and my wipers and cruise control do not work. I tried re-connecting the ground at different spots, replace brake peddle switch, tried a new brake light relay but when I put the new relay in there was no lights at all so I think the relay I bought was faulty. I have check for power with a test light and volt meter. every thing is getting power except brake lights when the ignition was turned. I ordered all new brake peddle switch and brake light relay from rockauto. the others were from Oreilles and CARQUEST
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