Turn signal help

[CUMMINS]

I noticed the other day that my rear right turn signal stopped working, the bulbs are fine ,I'm not getting power to it, I tested the wires upto the flasher box, and I noticed that when the left turn signals are on 2 wires carry the flashing current one for the front and one for the back turn signals, but when I turn the turn signal to the left only one wire has a blinking current instaed of two and only my front signal works, from there the wires go from the flasher up to the turn signal actuator on the steering column and I can't find any shorts, Could any body help me with this,

 

[jrosbo]

Blinkers

On my truck the brake lights go through the turn signal switch. Each light has its own wire coming from the switch. 2 for the back, 2 for the front. So you might want to check the switch. Also I see several different switchs for sale, I don't know what the difference is. Maybe someone on here knows. (I'm sure more than me, I am new to this whole MV thing.)