The right turn/stop signal originates on the Ford turn signal switch on the steering column. It also goes to the trailer right turn relay. Put a tester on the right turn/stop pin on the hitch connector. If it blinks, then the problem is downstream of the turn signal switch.
The signal is pretty much a straight shot from there to the right turn/stop lamp on the coach. This means the cause is likely a broken ground wire or a missing 12V wire at the light. The wires can look good, but still be broken inside a splice or connector.
There is wiring between the front and the back, and a pair of connectors. A break in the wiring, or one of the connectors coming unlocked, could cause a single wire to not be connected. Pretty long shot, though.
Let us know the result of the test at the trailer hitch.
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Mark
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
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