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Brake lights don't work but all other lights do. It's a 1990 Chevy 1500 short wheel base and I have replaced both circuit boards all bulbs brake switch and fuses are good. Checked and replaced ground

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Do you know what electrical testing is and how to do it ? apparently not ! Do you know what a wiring diagram is and how to read one ? Is there B+ voltage going into the brake light switch ? Test this first with a DVOM - digital volt ohm meter . If there is , with the brake pedal pressed ,is there B+ voltage coming out of the switch ? Find a diagram of the wiring harness connector locations look at every connector the brake light wires are in > Check voltage at each connector till voltage disapears . find the open wire , high resistance , what ever is cause B+ voltage not to be there . Watch videos on youtube for voltage drop testing . Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia How to read a wiring diagram . Buy a repair manual . Sorry dude , but if you want to fix car's , learn how .

Posted on Dec 29, 2016

Testimonial: "If you want to be a smart a@# hole don't answer at all. I was showing another person how to search a problem and you just showed how most people like to think that they are above others. Way to talk to a young person trying to learn !"

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  • William cundiff
    William cundiff Dec 30, 2016

    Have been doing auto and diesel repair 30 years. I build drag cars and boats.

  • Jeff Armer Dec 30, 2016

    Good for you , I been doing auto repair over thirty years , started in the late 60's . I have worked at Many GM dealer ships . I was on the pit crew of a drag race team . Why don't you teach them how to do electrical trouble shooting , not how to look for a magical fix . Half these people on here have no business trying to fix the modern automobile .I see it daily were there add on aftermarket junk. Try tying into data bus wires bring down the bus.If you so smart what's C.A.N

  • Jeff Armer Dec 30, 2016

    And if he want's to lean go to school !



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Yes, you need to of course check the voltage coming into and going out of the brake light switch, if 12 Volts are there going out and coming in while pressing on the brake pedal, your brake lights aren't getting a good ground or there is a break in the circuit between that switch & the lights.

On occasion the tail lights will work with a weak ground circuit where the Brake lights won't. Best way to determine this is to just hook up the 12 volt tester to the Brake light hot wire & there at the bulb ground, then in an area away from the bulb that has a good possibility of contact/ground.

Really that's it, if the 12Volts is getting to the bulb but it isn't lighting, if you aren't getting the voltage there and the brake switch is hot on both sides when pressed, the break in voltage will have to be traced from that switch to the tail light to find the problem.

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the circuit boards where the bulbs plug into are notorious for need to replace the circuit boards.they are available aftermarket.

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