Trailer Lighting Ground
Mud dog
Your assumption is correct. TM uses the external Aluminum layer as the ground for the trailer lighting. The sheet metal screws that hold/ground the fixtures can develop a little corrosion and not provide a good ground. By turning the screw, you cleaned the connection and reconnected the ground. This would be the first place to check ( after burned out bulb) any time you have a light out. It is just as important to keep the other end of the connection ( main ground to TM skin ) clean and tight as well.
This also explains why the radio needs an external antenna as it is surrounded by an large metal grounded shield.
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