I got a notice from Harborfreight that the tailights on my trailer had been recalled and they were sending me new ones. Once they arrived I had the old ones to play with. I figured I'd upgrade them to LED like the new ones I got, only better.....

Step 1: Gut the Lamps

I pulled everything out of the shells and picked some leds to use.

I toyed with the idea of 3W luxeon chips but instead I went for 10W chips for the Brake Lights. Ring Led's for the Parking Lights.

And some 10MM superbright leds for the marker lights.

Step 2: Main Assembly

I made a small bracket that matches the spacing of the rear bolt holes.

I used a chunk of aluminum to heatsink the 10W chip

then I then 3D printed a housing to hold the ring led up even with the face of the 10W led.

I pressed the original bolts into the new mount with the help of a small socket and arbor press.

Step 3: Marker Lights Too

for the little marker lights I decided on 2 leds each so I 3D printed a small square holder for them. I didn't go with constant current drivers for the 10W chips. I cheaped out and used a simple dropping resistor. I wrapped the resistor in insulation left over from a 3D printer nozzle rebuild. That way it wont melt its way through the case.