Whelen Model 64 Series Halogen turn signal problem

[kabsher8093]

Passenger side rear turn signal quit working the other day. figured it was the bulb. Bulb was blown so i replaced it. It still will not work as a turn signal, but it will flash when the hazard lights are engaged...
I figured it was a grounding issue do to it being on a fire truck (pumper). I tried a pulling the ground from the other rear turn signal, still nothing.
Checked fuses and relay, all good. I thought maybe it could be the turn signal stalk but the front one works..
Ant ideas?

Kevin.

 

[kabsher8093]

Fixed

 

[shues]

Fixed

What was the source of the problem?

 

[kabsher8093]

There is a 6 pin plug under the stalk that had come lose enough to only make the one rear turn signal to not work.