Your best bet would be to trace the running light circuit from the trailer connector all the way back to the lamps. You will want to pay careful attention to the point where the running light circuit for the right side of the trailer splits off from the circuit for the left side. Since the lights on the left side are operating fine, the problem most likely exists in the portion of the circuit after it splits off to power the right-side marker lights. Check for pinched wires or cracked or... view full answer...
The issue you are finding with your 2001 Isuzu Rodeo and your trailer doesn't have to do with the 4 wire vehicle side and the 5 wire trailer 4-way. Many trailers use what is called a wishbone harness that will run two wires to the same pin for the running lights. This style of harness simply make it so no jump wire is run from one side of the trailer to the other to pick up that running light signal because it is independently run to each side from the connector.
The issues you are... view full answer...
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