Third BRAKE light stopped working

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RP_NY

TYF Newbie
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On my 2003 Denali XL, I noticed that the third break light stopped illuminating when breaks are applied. The normal break lights go on. Is there a fuse or something that controls the third break light? Or is it a single bulb that burned out?

Thanks!
You can dis-assemble the Unit by carefully prying the Red len from the black body of the light. You will most likely find that the (1) 12V/1W Zener Diode on the circuit board needs to be replaced (do to corrosion) ($1 part)

Image below is what it looks like on 1999 K1500 Suburban
 

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