alternate ceiling light for when wiring is shorted

I should have said for the 12v hot wires coming off of that rear light circuit, there are 3 green wires coming off the hot post from the converter, that head out and split 3 different directions. One of the green legs goes to the bathroom light and fan, one of the green legs goes to reading lights and a rear compartment light, and the third green wire, the one shorted to ground goes to the light above the bed.