2015 Dumper Body Marker lights

[AgentGx44]

Owner of 2015 3500HD Dump Body: I am looking for information to help me troubleshoot my dump body marker lights. All the lights work on the truck. Only the lights that are on the dump bed are out.
I trace the wires to the two that head to the front of the truck . One is grounded the other is high resistance. The light switch position does effect it. Did not find any bad fuses. Does anyone know where the +12 comes from to turn this lights on? I would like to try a continuity test from the source. I can seem to find any info. If anyone has some info to help me find the problem would be greatly appreciated. Thanks in advance.

 

[crash68]

Unfortunately being a dump body that's aftermarket add on, even if you bought it from a Ram dealer. If I had to guess where the marker light were tapped into would be the running light circuit for trailer tow 7 pin plug. Double check the Trailer Tow Park fuse(use a meter, it's hard to tell with them), I think it should be fuse F29