Hi guys!
I have a problem with my tailights. When the headlights are on, the left green arrow inside the cab stays on, regardless if I have activated the left blinker or not. in others words it always stays on. If you look the front, just a solid yellow light, the back is solid yellow. Now when i turn the headlights off and turn on the left blinker, the green arrow inside the cab blinks normally, but the tails light are messed up. both running lights blink along with the left yellow. I'm so confused. any ideas?

 

i forgot to mention that i do have a wireharness for my boat trailer

 

t t t

 

Sounds like something is shorted or wired wrong.

Id dissconnect the wire harness for the trailer and see

 

it kinda sounds like a combination of a blown turn signal bulb and wiring problem for the trailer harness. it sounds like they tried to use a standard type plug, for the type of vehicle that uses the same bulb for brake lights and turn signal. good luck--hope i helped some