Hi,
I bet you have a bull bar with repeater (extra) turn indicators. These add to the current draw. The increase is sensed and brings on the trailer dash lamp. All normal.
The bit about the disappearing dash lamps is possibly due to a poor connection in the dash area or a ground circuit. -- The current flow (from the outside and working part of the loom) through the local lamp and then to earth has found a poor connection. This causes a bit of heat. The resistance of the joint rises a bit and that reduces the current, so this part of the circuit effectively goes "open" and ceases to operate - no light.
Look for a loose/dirty joint in/ around dash to firewall? earth point.
Rovers4.


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