Blinker problems 2006 379. Right side will not. work

2006 379 peterbilt left. Blinker and flasher work but the right side does nothing. Anyone have an idea what the problem is

 

did you check the fluid level

 

bearings are low on grease

 

Don't know if it's a PACCAR family defect, but I had a 680 KW with a similar issue, not sure if they're anything alike, but mine was in the wiring harness behind the bumper. There is a connector that t's off to each side of the truck...the connector corrodes.

 

Wiring down around hood hinge
Wiring back of headlights
light sockets corroded
Turn signal and marker light just shake to pieces.
Its one of those if not all !

 

Defective switch. Did you check to see if the signal to the lights is actually leaving the switch?