i have a simple wiring question, i'm trying to wire my cap (led brake light), and interior dome light, the lights are simple 2 wire connections (pos/neg). now for the brake light how do can i attatch the wires so that the brake light works (if possible park light too), currently i tapped into the trailer wiring harness and everything works, but if i turn on a turn signal the truck cap brake light blinks. any thoughts? thanks