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3rd brake light


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Might already be moisture in there and the bulb failed because of that.

 

Its not so much the seal that fails, the plastic lens is what will develop a crack and let water into the lamp, then your headliner.  The GMT-900s were notorious for water leaks.  The screws were overtorqued from the factory and then over time from body flex it would crack the lens.  

 

If the seal on the lamp is bad, its only serviced as the lamp assembly.  

Edited by newdude
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What's crazy is the dealership wanted 47.00 dollars to change bulb. I stopped at napa and got bulb for 1.49. I had it in for transmission drain and filer change and they found it was out. Mine does not leak now so I may just leave it.

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