I installed Hella FF75 driving lights awhile ago, using their wiring harness. I use the stock fog light power wire for the "switch" pin on the Hella relay.

Every few months the lights will stop working; when I check the new relay, the prongs are beginning to rust like they have too much amperage going through them.

I'm not sure how else to wire this. Can anyone offer some suggestions?

 

Anyone have some ideas?