I thought signal use was optional. I don' see them used by other cars.
If you have a test light, check the connector between the TV and Trailer. Once you determine that there is juice going to the trailer I would jump back to the tail light and test back there to see if there is a problem there (might be a loose or corroded connection). If you do not find a problem at the tail light, go back to the connector on the tongue and follow it back, testing it every now and then until you find a spot with no power. In between the last point where there is power and where there is no power is where the problem will be.
Matt O 2006 Skyline Nomad 27' travel trailer. Previously owned 1986 Coleman Columbia / 1992 Coleman Senecca / 1989 Born Free Class C RV.
Here is a link to the trailer wiring thread that includes diagrams. If you have a test meter (or you can buy one for just a few dollars). Print the wiring diagram and use it to test the TV (tow vehicle) side to narrow down if it's the TV or the camper.
If it's the TV, trace the wire to find the problem. If it's the camper, check the bulb first. (I normally swap the bulb with the other side if they are easily accessible)
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