Hella 550 crapped out

I installed a pair of Hella 550 fogs about a year ago. No issues. Last night they cramped out on me while driving home. Both lights and the light on the switch inside the cab. I checked all the wiring and everything looks good.

I'm thinking it might be the relay. There is no fuse so did the relay just die? How can I check?

What might be the issue if it isn't the relay?

Thanks

 

No fuses anywhere? That's no good. Need a fuse in the main power wire going to the relay, and should have a fuse in the wire going to the switch as well, ideally, but not necessary if you tapped into a factory circuit that's already fused.

If the switch does not light up, there is no power to the switch, or the ground to the switch is disconnected. The ground being disconnected would only disable the light in the switch itself, I suspect no power to the switch. Check that first.