alsatropine

iTrader: (2)

I recently swapped my 04 f150 4x4 to leds. I hooked up my trailer today and the lights dont work. I swapped out the flasher relay so the leds would slow blink. My trailer lights are halogen. I have power at the truck plug but as soon as i plug in the trailer the leds dont flash right. Am i doing something wrong?

Mechanik

You know a lot more about these trucks than I do, but I can't help but wonder whether the combined multiple LEDs have led to a power drop that no longer triggers the trailer relay. Long shot, but maybe check the input voltage to the relay?