Question about 2002 Chevrolet S-10

3 Answers

Right turn or brake light not working

Bulbs good. No power at socket. Wire ohmed from socket to fuse box. All fuses good. Tryed new turn switch also. Any other suggestions?

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  • japad Jan 28, 2009

    Great suggestions guys! However that wasn't the fix. Don't have power at brake/turn signal whatsoever. Any other suggestions??

  • japad Jan 29, 2009

    The brake and turn are on same element. The park light does work. ABS fuse is good. Take bulb from right to left it does work. No offense taken on I.Q. When the problem is found I probably will kick myself! Another thing is that I was pulling a trailer with questionalble lighting system when quit. I figured surely it was a fuse. Not that simple!

  • japad Jan 30, 2009

    Have an in line plug in style pig tail. Checked where I unplugged to put in pig tail in harness connector and had no voltage. I have since taken pig tail harness completely off. Actually have no voltage in the wire at the fuse box. Test light worked on the left side wire though so I know I had ground. I really apprectiate your going through this. I am going back and checking everything you are saying. Where could a person get a copy of the wire diagram, for free or is that possible this day and age?

  • japad Jan 30, 2009

    Brake light on right rear does not work. Turn signal on right rear does not work. Center stop and left brake do work. As well as left rear turn signal. Right front bulbs are all working working. Taillight on right side does work. What is MFSw? Where is it? I have tryed a new turn signal switch on steering column. Thanks!

  • djkoogler May 11, 2010

    Right turn signal grounds on the right radiator support you might want to check your ground. As for brakelight, power (ground) is run through abs and cruise control modules so futher testing may be needed.

  • Roberta Smith
    Roberta Smith May 11, 2010

    locate the ground wire... unscrew it and clean the metal contact points then try it.




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Questions? Do any of your brake lights work? Including Center Stop? Do your parking/taillights lights work? All your bulbs are multi-filiment bulbs that work through mulitple sources. Knowing which bulbs are doing what under all conditions might help narrow down the problem. Meanwhile, check for continuity between, stoplight switch and multifuntion switch (white wire). Also, check DrkBlue/White from MFSw. to Boby Control module. BE SURE to use a low inpedance tester to protect your modules. The DrkBl/Wh wire is your rigth side input. I may be a good idea while testing these wires to wiggle them to look for intermitent shorts.

Posted on Jan 30, 2009

  • djkoogler Jan 31, 2009

    MFSw is a Multi-Function Switch. I combines turn signal with cruise control and wipers, etc. It should be what you already replaced. Power for both your Rt turn and Rt brake comes through the MFSw. The Dark Green/White wire comes from MFSw and goes to fuse block under the hood on top of the left fender. From the fuse block it comes out just Drk Green and goes to right rear turn and brake and it grounds at the right rear frame rail. The Dark Green wire and the DrkGrn/Wht are the only wires that carry power for both turn signal and brake. Before that power comes from flasher to MFSw and from Stoplight Sw to MFSw. You can rule out power issues with Stoplight switch because it supplies both sides with one output.

    Knowing that if you check the output power from flasher to see if the power is getting through your MFSw (turn signal) into your DrkGrn/white wire. If its not getting through the problem is in the MFSw. If its coming out but not getting to the light than the problem is somewhere in the DrkGrn or DrkGrn/white wires or the RR turn signsl fuse in the block.

    I looked at a diagram for a 2002 Chevy S-10 P/U 2.2 or 4.3.


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Check the fuse inside the car and then check the fuse under the HOOD inside the relay box. :)

Posted on May 05, 2009

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Take a test light (not self powered) turn on park lights. Ground test light. Touch it to known hot. If it lights, you know you have a good ground for testing. Now, with lights still on, probe the bottom terminals being careful not to touch sides of light socket.Find terminal that lights up indicating park lights. Now, probe other terminal. Have an assistant press the brake. If it lights up, also try turn signal. If it lights up, problem may be with distorted or otherwise misaligned socket. As with any electrical circuit, ground is imperative. If corrosion has made its way into the ground wire terminal. Cut it off and replace it. Let us know.

Posted on Jan 28, 2009

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  • Patrick  Bogan
    Patrick Bogan Jan 29, 2009

    Followup ck list:
    1.) Upon inspecting bulb...Does it have two (2) elements inside the bulb? Remove bulb...hold up to a light (Say, in the garage) you will see two separate elements (sometimes referred to as a filament) inside bulb. If present, look very closely to verify both elements are intact. If only a single element, you have found your problem. I.E. Each element has its own function. One for park light, one for brake/turn. If you havnt already, take the suspect bulb, and insert it into the opposite side socket (same socket on other side of vehicle) Make sure park and brake elements work (notice diff.element lights for each function)
    2.) Also ck.underhood fuse panel. There is separate fuses for left/right turn. look under fuse panel "lid" for fuse location legend. Also ck.ABS 60Amp fuse

    Let me know


    P.S. By asking you to ck. things that may seem obvious does not assume your I.Q. is more/less. Im just not going to qauntify anyones I.Q. so its not part of the equation. ed

  • Patrick  Bogan
    Patrick Bogan Jan 29, 2009


    Did you wire the trailer, or someone else? Retrace your steps (or pick the other persons brains) Electricity, or the lack of it, can do strange things. On another note: Lets say someone used a blue piggyback splicer. In doing so, the splicer effectively severed the wire inside the jacket, but the jacket is still intact. And, at the same time, you have an intermittant problem which is only evident by wiggling the wire back and forth which may cause your previous test to be null and void. Do U have a wiring diagram of your vehicle. Verify your diagram is for:

    1. 2002
    2. ABS/non ABS
    3. Export/non export
    4. Pick up/Utility (SUV)

    I know what you mean about "kick myself" I've had my A#@ K$#@ed by some really stupid S$#T!


    Let me know

  • Patrick  Bogan
    Patrick Bogan Jan 30, 2009

    Japad, uses alldata which may or may not have a comprehensive diagram. Also ck with your public library system, as some have agreements with publishers like chiltons on line access.


    Please Rate me by scrolling down to the colored flags and choose which catagory best fits my response.


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