This is how to add LED DTRL's using $15 Generic DTRL relay

This is for trucks that have 2 wires going to the bulb.

The reason these DTRL boxes would never work with LED bulbs was that when the signal for the turn flasher was sent to the DTRL box the circuit was completing using the DTRL boxes ground, so the ECU would not detect any resistance and think a bulb had burned out triggering rapid flashing. I simply pulled some diodes out of an old computer power supply and put them in line on the positive wire coming from the truck, problem solved.

Now I have added LED DTRL's with proper working turn signals without having to take apart the fuse box and add the OEM modules