Hey guys, I have a question regarding my friend's car. When he turns on his headlights...all the lights go on. However, when he puts the brakes on only the 3rd brake light lights up.

He had a hole in his tail light and some water got in there. But, the bulb still lights up.

Any ideas what I should check to troubleshoot??

Thanks

 

the taillight bulbs have double filament, maybe the filament for the brakes are blown, change both bulbs and make sure you use a two filament bulb