The best way to test the lighting functions on your 4-pole harness # 118334 is to disconnect the trailer and apply a circuit tester like # PTW2993 to the connector's pins. You'll need a helper in the Grand Voyager to activate the light functions while you apply the grounded tester to one circuit at a time. The linked video shows how the tester works to tell you when a signal is present.
On your 4-pole wiring setup the brown wire carries running lights (on when your headlights are on) and... view full answer...
I recommend testing the wiring harness for a malfunction. Using a circuit tester, like # PTW2993, test the wires going into the converter box for the proper function. If, when you test the right blinker, the signal is absent or otherwise incorrect, then there is a problem with the vehicle wiring, possibly a ground problem with the right taillight.
If the functions are all correct, test the wiring coming out of the converter box. If the signals going in are correct, but wrong coming out,... view full answer...
The problems you are describing are typically associated with a poor ground connection, but it could also be the result of a faulty converter box if you are using a plug-in style wiring harness like the Curt T-Connector Wiring Harness, # C55334, that you referenced.
If the wiring harness was working in the past and the problem just started, then the converter box could have shorted out, which would cause a variety of different issues. If this is the case, then I recommend replacing the... view full answer...
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