Originally Posted by tallredboned
where is this?
Get a 12v
Bare the wire from the trailer that goes to any of the marker lights (careful not to touch the trailer)
Connect 1 test light wire to the trailer wire you just bared, other to ground
Hook up the TV, parking lights on
If the test light doesn't light up you have an open between the trailer pig tail plug and the marker lights. I would check the plug's condition, see if there are any breaks on the plug to pig tail wires
If the test light does light up, you have power but the lights aren't installed correctly. Either the power or the ground isn't connected properly
If the test light doesn't work and the pig tail plug looks good then you have a problem unless you can trace the 12v
marker light wire from the trailer pig tail to the trailer marker light connection / junction. I don't know where this is but since all of the lights are out it would seem that this is your problem.