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Chevy S10 - GMC S15 and Sonoma Electrical Problems



  • gonogogonogo Posts: 869
    Well seeing it's the driver side, I would suspect the wiring when it enters the door.The opening and closing the door has probably broken the wires.
  • wborenwboren Posts: 1
    i have the same problem, any positive feed back on this? any help would be great
  • I have a 2002 Chevy S-10 Crew Cab Pickup. The fog lights and ashtray lights are not working, I checked the bulbs and fuses and they seem to be fine, is there a relay that could be cusing this problem? Also the window control switches are not working in the passinger and rear doors, but the the windows roll up and down fine by using the drivers side controls. How do I fix this? :confuse: and is it linked to the fog lights and ashtray light not working?
  • Hey. I have the exact same problem as you on my s15. Everything was working fine, until I decided to replace my license plate light sockets and bulbs. Now my parking/ running light stopped working but my signal and break lights still work???

    Did you find a solution????
  • I have an annoying light problem, having trouble fixing!
    My license plate lights weren't working so i decided to change the sockets and bulbs, apparently big mistake. Now my drive lights in the front and rear are not working along with my dash lights and passenger side courtesy light. But my break/signal/reverse/head lights are all working perfectly. Im thinking this may be a ground issue..... need help!
  • I am having to guess here but if you have a trailer wire harness attached, it may have rubbed and grounded itself out. Ground issues on the S series seem to be an issue and with a bazillion grounds it is tough to trace which is the culprit. Also I have heard that putting bulbs in that are not the exact appropriate bulbs will jack up the system as well.
    I love my S10 but the problems are frustrating. Its a truck. It should be simple. Good luck and let us know what you find.
  • the_big_althe_big_al Posts: 1,068
    I also point to a ground issue... I just fixed one on my truck involving the turn signals in the rear. Might try and see if you can locate an electrical schematic to see what is tied into what (that may or may not help since a lot of things are tied into one thing or another depending on what is being used or not used), or just start tracing wires. I would start at the license plate lights since that is where the problem started and go from there. Trace all the wires connected to them and see if there is a wire rubbed bare or corroded.
  • esw03esw03 Posts: 2
    I have a 1997 S10 ZR2. Last night I changed one of the headlights while the truck was running, so the daytime running lights were on. After changing the headlight, the power windows, cruise, heater mixing whatever (?) won't work, and the ABS light is on all of the time. I have checked all of the fuses and breakers and they are all ok. Does anyone have any ideas on what could be wrong. Thank you in advance.
  • gonogogonogo Posts: 869
    Try removing the negative battery terminal for 10 minutes, maybe a processor will reset.
  • esw03esw03 Posts: 2
    Thanks "gonogo" !! Believe it or not, a couple of hours after I posted the question, the problem just went away. It worked great until last night. I started my truck and all of the previous problems had returned. I unhooked the negative battery terminal for about 30 minutes but it didn't fix the problem. Does anyone have another idea.
    Thanks again!!
  • gonogogonogo Posts: 869
    Intermittent uh. Check for power at the fuses where you have lost power. Cruise , HVAC etc. The ignition switch maybe the problem, not the key one, the electrical one.
    If you can tell me which fuses don't have power, I maybe able to trace it to the ignition switch.
    A 12 volt test light is real cheap.
  • elmo7elmo7 Posts: 1
    I have a 96 S10 V6, I need to find the oil pressure sensing relay
  • q48q48 Posts: 1
    I have a 2002 S-10 4.3 4WD. The problem I have is the tachometer flutuates(pings) whenever I hit passing gear or go above 2300 RPM. It also flutuates when going downhill or letting foot of accelerator and then reapplying until engine catches up to tach speed. I had alternator, crankshaft position sensor, Camshaft position sensor and distributor replaced. Tune up is all new (plug, wires cap and rotor). New transmission was done 3000 miles ago but problem existed before. I really need an answer to this because I drive 100 miles every night to work
  • I have a 1988 GMC S15 and the tail lights/ dash lights dont work with the engine on or off. I checked all the bulbs replaced them and put them in and turned the headlights on and the fuse kept blowing. ive checked every other fuse and they are fine. I realize that it is a short in a wire somewhere but I have looked everywhere from the taillight sockets to the cab behind the fuse box and havent found any shorts. what should I do?
  • I have a 97 S10 with the 4.3 X-vin MT, when i let up the e-brake, turn the headlights on, perss the brake pedal or sometimes when i put the truk in reverse i get what seems to be a circut overload. Some times the radio will turn off and then back on, sometimes the truck will bog down like tis got too much fuel, and sometimes the enire truck will turn off if i let the idle get to low when it bogs. And very raily (but is has happened), the truck will turn off and on all on it's own while driving down the road without touching anthing at all. Ive been messing with it for months, battery good, alt. good, changed the light switch and check all the connections under the dash and all the body grounds and they are all good...any suggestions?
  • monsonmonson Posts: 5
    i have a 1995 sonoma s15 which has been a very good truck, 3 months ago i would turn on the turn signal and both lights would flash. i did some checking and someone said to check the bulbs. the cleaarence light was burnt out so i replaced it and the problem was solved. now i have the same problem when you turn on the tailights there is none, when you hit the breaks the light comes on and stays on but is dim. you then have to turn off the headlights. also the clearence lights are very dim. we also noticed the tailights would flash and then the top brake light would flash. it looks like a squad car going down the road. lite bulbs are basically dim. any feeedback or ideas i just got the vibrations fixed on the car. whether it has nanything to do with it t he car radio has power but no sound comng out of the speakers
  • Dim lights are usually caused by bad grounding. Take a jumper cable and connect one end to a known good ground. Connect the other end to various places on the chassi near the lights and see if that makes them brighter. Also look for loose connections or a loose fuse for that circut. If your brake light is sticking on, it is usually a faulty brake light switch. First fix the dim light problem though.
  • the_big_althe_big_al Posts: 1,068
    I second the bad ground. I had an issue a few months ago with a bad ground. It dealt with the turn signals. When I would use the signals, it would basically make all the lights in the rear flash in someway. The reverse lights wold flash like a turn signal, the license plate lights would also be part of the pattern. In short the rear lights had issues when I used the turn signal.

    I traced it to a bad ground under the rear frame right before it branched out to the trailer wiring. Check the wires coming from the lights and then under the truck. Especially check areas that are exposed and prone to road and water grime, or even under the hood where heat and oil can possibly affect them.
  • Thanks for the info guys i"ll try the grounds to see if i can find something. i did notice the front turn signals are bright so there is no problem with them. I just figured they wee on the same circuit as the tailights but evidently not. i wasnt sure what grounds to be looking for but now i have an idea where to start.
  • jima3jima3 Posts: 1
    I have 2003 S-10 4wd with an automatic transmission. When you get the tuck moving the it appears to be okay, but when you put you foot in the gas to pull out, the RPMs go up to 3K but it doesn't shift gears. The fastest this truck will move is 40 MPH. The other interesting thing is the MAS keeps trowing a P0101 code. I replaced the MAS and traced the wiring back to the PCM.

    Could this be a bad PCM?

    :cry: :sick:
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