I've installed one side and am currently using it to turn on my grille letters when the headlights come on. Using the second box is mainly if you need the turn signals, (if I understand this correctly).
@Mabett I don't see anything in the specs as to how much power the things can support. I...
From what I can tell this does operate via relays. You power the box from the battery and then the triggers are from the headlight circuits.
https://www.bronco6g.com/forum/threads/mabett-headlight-adapter-harness-for-ford-bronco-available-now.91320/post-2201724
The No Double Honk Bronco Crew headed back out to Triangulation Point (more specifically South Triangulation Point) to catch the sunset over the Pacific Ocean and then to wait for the Northern Lights. Afterwards we stopped at Kilchis Falls to see what it looked like dark. It was an amazing night...
So far no issues. While I get off road as much as possible it’s rarely high articulation stuff. Still I’m hopeful. But also contemplating the extended warranty.