No brake lights on my 1994 cheyv silverado 4x4 1500, changed brake light switch, changed tali light boards, check ground, Third brake light comes on, has aftermarket trailer wires, brake light indicator comes on the module??????
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there is a known problem with the circuit board the bulbs sit in ..most parts stores sell them in the "help" section or "dorman products" section if you want to check it properly you will need a test light and a friend...first thing you must attach the test light end to a good ground source put the other end in to the electricle connector one wire at a time of the brake switch push the pedal if it illuminates on a wire only when the pedal is pushed it is getting powered up and functioning next go to the back of the truck and do the same with the tail light ..use your friend to push the pedal and test for power present in a wire only when the pedal is pushed if that is there then the power is getting to the tailight next you must check for ground so put the test light end on power you might need a piece of wire to extend to the back ..be carefull probe the plug if the test light illuminates there is a good ground there and you need to change the board
I've worked on these the first drove me crazy. its the turn signal switch every thing runs thru these. head lights, turn signal, brakes. except the third brake light. it runs directly from the brake switch. go figuare
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.
you have a broken wire some were if you cant find it you can run a seperate power wire from the third brake light to the brake lights but i would check for power at the brake lights first to make sure its not a ground problem
Check at the light socket in the rear, where your lights don't work. You need a test light or a voltage meter, and check to see that you have a groun there, power for your parking light, and power to the brake light. You should have power for the parking lights seeing that it works, and a ground. Just verify that your power for the brakes is getting to the bulb, or not. Just a good place to start.
And you are correct that if the third brake light works (top) your brake light switch is fine.
It is a common chevy problem for the circuit board that holds to bulb to fail, are your running lights and signals still working back there as well? If not then you need to replace the boards.
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