Having issues with lighting on my T100. Everything was working then I discovered brake lights weren't working. I poked around fuses are good I have power to switch switch seems to function properly. Today I pulled taillights and discovered tha taillights and front marker weren't working either.Is there a common ground point for these lights? I see separate wires to each socket in taillight housing.

 

Got a trailer setup? Check the grounds on that, also see if the trailer connection (if you have one) is wired into the light sockets themselves. I had a weird issue where my entire truck blinked in unison with the blinkers. Removed the trailer connections that were inline to my lights and problem went away, put a new setup on and no issues.

 

No trailer wiring. I am thinking it has something to do with the stupid lighted washer fluid squirters. Got some funky wiring going on. Can't see where it's tied in.