Brake and turn signal lights stopped working on trailer. No signal from tow connector at truck BU, tail and aux ok. Lights on 97 ford f150 ok. Tow connnector has own harness. Fuses good. Is there a secondary flasher or a relay for the tow plug? Any help appreciated. Have chilton Manual, but schematic is a joke. ANy one have Haynes that can take a look a the wiring and send me a pic to chevota@msn.com?