Originally Posted by Charming Wino
...The puzzeling part is when I changed the bulb out for a new one it light up brightly but did not blink when asked. Then when I disconected the TV the light stayed on...
I suspect the problem is where the trailer wiring meets the plug that goes to the tow vehicle. I cannot remember the wiring color code, and I do not have a schematic in front of me
but I believe the battery wire color is blue.
First, verify this problem exists without the round pin to flat pin adapter installed. If removing the adapter fixes the problem, please respond - there are options.
If it does not fix the problem, and your round pin plug has screw down connectors for the wiring, examine them very closely. I suspect the battery wire is touching the turn signal wire because the wiring connectors are pretty cozy in the round pin plugs. Also be alert for a single strand of wire being loose from a connector.
If all is in order, then start looking for frayed insulation. On most larger travel trailers, the trailer wiring is done at a certain point during construction, and then a six foot umbilical, with T.V. plug on one end, is connected to the wiring. On my Overlander, this interface is behind a screwed on access cover on the forward, starboard side of the belly skin. I have heard other people mention their wiring junction is accessed from the inside. Make sure all looks good here too.
If none of the above, please respond - I'm sure the forum can get you on the road.