I bought led lights for my truck bed from F150leds. The instructions to install the lights on the driver side were dead on correct but the instructions for the passenger side to install i do not think they were correct. The instructions said the hot wire in solid purple and the ground was black&yellow. I used those wires but the lights do not work. I did notice that there are multiple black&yellow wires. I do not know how to use a multimter to figure out what wire is hot and what wire is ground. Can someone help me.