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Lyledavid, I just posted this on another thread,but will add it hear.
You have a model year there could have a sub fuse box just for the trailer lights. Do all the marker lights,turn signals and stop lights work at the trailer plug?
The marker lights may have some corrosion at the sockets or a defective ground connection at some point.
Regarding the brake lights on the Coach,the signal comes from a switch at the air brake valve located under the floor. There are two switches,one for each of the valves. On feeds the coach brake lights and the other feed the trailer brake circuit.
These connections are exposed to the elements and get corroded.
Tight little area to get to,but it might be worth a look.
Attached a picture of a sub fuse box used for the trailer and Ignition start circuits on some models.
Dick.
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