Took my truck & camper to camper place to have brake controler installed & camper inspected.Picked them up after dealer had closed. There was no brake lights or turn signal lights when I went to leave(they were working when I dropped it off)brake control was working though.I wanted to leave it but needed the truck the next day.Called dealer the next day and he said that they were working when he inspected it and that a wire must have came loose. He told me to bring it back and he would fix it or I should just look for a wire that came loose if I didn't want to bring it back down. Would like to try to fix this on my own but not sure where to look. Any idea's ? Brake control unit is a Tekonsha 9030. Truck has factory tow pkg. with 7 pin connector.

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97' F150 XLT extended cab short bed w/off road pkg. 5.4 3.55ls Tow pkg.