There are a couple of ways to connect the power source up. One
way is to connect the lights through your 7 way plug and using one
terminal for the backup lights and connecting them to your tow
vehicle back-up lights. The other way which I did was to simply
connect the power source up to my camper battery. I did this cause
a lot of time I need extra light . (remember I do a lot of fishing and
some times I get back to the campsite after dark). I installed a toggle
switch on the side of the camper to turn them on and off. This way
I can use them any time I need any additional light.