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Well i am lucky that the tail lights (stop and turn signals) are LED already. But this being a horse trailer i dont know what else the lights are connected to say the lights by the horses witch are not LED or lights in the kitchen or bathroom. So i figure id have fun and make one of these.

Does 8amps for service light and .5amps at 12v for each turn signal sound right?

Yea I was about ready to pull my hair out. But eventually after burning one resistor up I figured it out. The board is so easy to make, you came up with such a great idea!

I can but that would be to easy. I was kinda do this just to have a project for fun. I did figure out tho why i wasnt getting any voltage drop. The resistors will take in 24v and send out 24v if there is no load on them. That is why its important to check how many amp load is guna be on each...

So i tried to make the same boared as you for the lights on my horse trailer, well i got everything done went to check the voltage drop. Connected the board to the battery to with some jumpers. Then i took my volt meter and tested the other end of the resistors and it still came out at about 24...