Question about GMC Sierra 1500

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The brake switch has been replaced. I was able to get the brake lights to work but the next day they don't. I don't know if switch is bad even though it is new or the adjusment is not right or if it is something else. The tail lights, license lights, and turn signals work as thet are suppose to. What do I do? Thanks James

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Hello! James, Please tell me the year and engine size of your vehicle and I'll get to work on the problem...Guru...........saaoler

Posted on Jul 16, 2010

  • 3 more comments 
  • fullerfarms Jul 16, 2010

    Sorry about that

    1989 GMC C1500

    350 engine

  • David Burbee
    David Burbee Jul 16, 2010

    Hello! You'll need a multimeter... If you do not have one...You can pick one up at any home improvement store for under $20...Set the meter on X10 Ohms scale...Place one probe on the center of the - battery post...The other on bare metal of the chassis...Must read zero ohms...Full needle deflection...Leave one probe on the - battery post...The other on bare metal of the engine...Again zero ohms...

    The Brown lead at the brake lights is the hot wire...Make sure that there is a solid ground (zero ohms) at the ground side of the brake lights...

    Set the meter to read 12 volts...Connect - probe to ground...And the + probe to the Brown wire at the new switch...Watch the meter as you apply the brakes...Very little brake pedal movement should show +12 volts on the meter...Adjust new switch so a reading of +12 volts is on the meter when very little pressure is applied to the brake...

    Send a comment if you do not read correct ground and/or battery measurements...Saailer

  • fullerfarms Jul 16, 2010

    I have a Sperry HDM350 Multimeter. I am try to figure out the set the meter to x10 ohms scale? and how to set it to set it to read 12 volts? Thanks

  • David Burbee
    David Burbee Jul 16, 2010

    Hello! Let me assist...Lets attempt a fix without using a meter...You have installed a new switch...Drop the switch down ...And short the 2 wires, that are connected to it, together...Turn on the key and see if you have brake lights...If you do...All wiring and bulbs are OK...Mount the switch...And adjust so when you lightly touch the brake pedal the lights come on...

    If lights do not come on...I'll talk you through using the meter...


  • David Burbee
    David Burbee Jul 16, 2010

    Hello! Here is how to use the Sperry HDM350...For continuity and resistance...Turn the knob to the the lower quadrant... Set the pointer on the 2K setting...Touch the 2 probes together and zero the meter...Now you can test the ground connections...To test for +12 volts...Turn the knob to the left...Top quadrant...DCV...Set pointer on 20...Put probes into the COM and V ( omega sign=ohms)...

    If you need any help send a comment...I'll be on-line until 8:30 EDT.............Saailer



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