M1088A1 Blinkers not working

[BeetTrucker]

I have a 2002 Stewart and Stevenson FMTV M1088A1 and the blinkers/flashers will not flash. They worked fine and then randomly quit. The bulbs all work they just won’t flash when putting the blinkers/flashers on. Wondering if anyone has had this happen and a fix to it. TIA!

 

[INFChief]

We’re you pulling a trailer at the time? Check to see if you can hear or feel the relay respond when the turn signal is switched to L or R. Also make sure the light switch is not set to blackout drive.

After the “quick & easy to check” items are scratched off you’ll need to get out the manual.

 

[BeetTrucker]

We’re you pulling a trailer at the time? Check to see if you can hear or feel the relay respond when the turn signal is switched to L or R. Also make sure the light switch is not set to blackout drive.

After the “quick & easy to check” items are scratched off you’ll need to get out the manual.

There is no power to the relay and checked the blackout override swicth and that was off.