LED brake lights?

Famous bob , I didnt do the cars yet since they are dissassembled. I did buy different flashers specifically for use for the LEDs in the cars so they flash at the correct speed. The flashers i ordered off evilbay have an orange cover with a small hole to access an adjuster screw so you can fine tune the flasher speed. I bought a few extras since they were only a few dollars each. On my trailer I did nothing, just plugged them in. Enough resistance with the truck wiring that I did not need a heavy duty flasher. Stock truck flasher worked just fine.

Pishta , as far as DOT regs go automotive exterior lighting on a taillight or signal bulb. I have never seen a DOT approval on any lightbulb unless it's a headlight assembly. The DOT approval on any other light be it a taillight, signal lamp, marker lamp is an approval on the design of the lens itself, not what's behind it illuminating it. So as far as using LED bulbs in a taillight or signal light goes, who cares as long as they are bright enough to get somebodies attention.

Screenshot_20200721-084025_eBay.jpg