I have a 2007 Toyota Tundra with the factory tow package. I have always pulled trailers with no issues. But now all of the sudden I have no trailer brake or turn signal lights on any trailer. One of which has brand new wiring. I can use a volt meter with out a trailer attached and the 4 way and 7 way both have 12 volts when the brake is applied or the turn signal is turned on. But as soon as I plug a trailer in the circuit goes dead. If I unplug the trailer let off the brake wait a few seconds and test with the meter I have voltage again but as soon as I plug in a trailer dead again. Anyone have any ideas? I have traced wires checked connectors and can’t find anything. Thank you in advance.