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Discussion Starter #1
going to lend the garage to a buddy today. his 03 silverado ss has no brake lights. he has the top (third) working but nothing at the tailgate. he has tails and turns and that is what confuses me. we havent torn into it yet, thought someone may know of that "one time on my tow rig" any help appreciated
 

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Discussion Starter #3
the switch isn't it it is geting power to the third brake light..........he didn't come over yet so still looking for options
 

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I say check the fuses. generally speaking the 3rd brake light is on a different circuit for this exact reason. so that if the main brake lights go out the third still functions properly.
dumb question but I gotta ask. have we checked to make sure the bulbs are blown :wink:
 

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could also be a bad ground on the back end.
 

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Discussion Starter #6
he still never showed but on the chevy the turns are the same bulb....no? but they work fine
 

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erpp said:
he still never showed but on the chevy the turns are the same bulb....no? but they work fine
some yes some no. it also could be using one element of the bulb for turn and another for brake and then changes when the tail lights are turned on.
 

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Jeepless in PA
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MPETE said:
erpp said:
he still never showed but on the chevy the turns are the same bulb....no? but they work fine
some yes some no. it also could be using one element of the bulb for turn and another for brake and then changes when the tail lights are turned on.

They are dual element so when you have the light housing apart, take a look at the filament. I had the same problem on an 02 Chevy Trailblazer and it ended up being the bulbs.
 

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what about the "tail light circuit board" not sure if it is the case on that truck but i know some of the chevy's used that design and it was prone to failure.
 
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