Wiring single wire clearance lights

[Pickupman_69]

Im terrible with electrical stuff but I want to wire up a few clearance lights. I already have a switch. but what really confuses me is the single wire on the lights, would this mean they are already grounded? or will I have to find a way to ground them? if so how.

Im guessing I also need fuses and a relay, I tried hooking them into the wiring my off road lights were connected to but it wouldnt turn the lights on.

any help would be great

 

[ChallengerDave]

Id imagine that have a way of grounding them self maybe from the mounting holes. I know some lights I wire for our big trucks at work use a metal sleeve through a bolt hole to ground it to whatever its mounted to. Dumb idea in my opinion. Have any pics of these lights?

 

[MidnightRebel07]

The ground is on one side of the light assembly and uses the mounting screw (goes into roof) as the ground. Then the hot wire just gets wired into either a switch or your marker lights like mine are...

Back roof lights (mounted on the roof rack cross bars), gonna add two more like the front eventually...

Front roof lights...

Then three in behind the grille...

 

[Pickupman_69]

thanks guys that makes sense now,the one end of the lights does metal in a screw hole.

I think ive got it now