Back2PA
Well-known member
- Joined
- Jul 26, 2015
- Posts
- 5,766
I occasionally tow a utility trailer with my toad (not double tow, just moving stuff). I recently discovered the RH turn signal not working on the utility trailer (all lights fine on the truck). Would have bet money the problem was with the trailer and figured I'd have it fixed in a few minutes. Well, as my luck would have it this is not the case. Trouble shot it back to the trailer plug (factory tow package) and no power on the RH TURN/STOP lug. Confirmed no incoming power for RH turn at back of plug. Since truck has separate turn/stop bulbs and trailer plugs are wired to combine them I knew there had to be a combiner somewhere and I believe I found it (them). There are two modules in the vicinity of the RH rear light cluster on the truck. I have confirmed (incoming?) intermittent (blinking) 12V to one, with no output so that seems like an "ah ha" moment, bad module. Then I tested the other one, which I have labelled with an "I don't know" and a question mark. The reason I labelled it thusly is that module has steady 12V with the taillights on. Seems to be there should be no module involved with taillights and they should be passed through to the trailer plug. Finally, the ? module also has no output.
Lying under the truck I'm kinda stumped as to the routing of power from the harness to the trailer plug. I'm guessing that all the various wires (turn/brake/tail/backup/ground) are attached as "inbound" to the light cluster, then, at the cluster connector, the turn/brake/tail goes outbound to the combiner modules then onward to the trailer plug. I'm baffled by the 12V to the "unknown" module.
Appreciate any assistance
Lying under the truck I'm kinda stumped as to the routing of power from the harness to the trailer plug. I'm guessing that all the various wires (turn/brake/tail/backup/ground) are attached as "inbound" to the light cluster, then, at the cluster connector, the turn/brake/tail goes outbound to the combiner modules then onward to the trailer plug. I'm baffled by the 12V to the "unknown" module.
Appreciate any assistance