ok i am out of sorts. I have rewired my trail with a new wire harness. straight forwar to 2 lights. got my adaptor to pulg it in to my unit the unit is a 5 plug the trailer is utility so a 4 plug. hokked up every things works great then i put on my head lights and park lights. that when all went to the pots. with parks on and i hit my brakes the light s on the traileer do not work and with the parks on and i use my signal i get the 4 way flashers. i have check my ground added an extension and cleaned the bolt is hooked too and added a 2 ground wire from the unit to the trailer. there are no splices to the harness. any thoughts as to what is going on other then a gremlin lives in the trailer. or a stick of dinamite should be used. Angel