Hi Guys
I’ve recently swapped my non locking transfer box out for a CDL transfer box. When it came to wiring up the diff lock light I see a lot of ways people were doing it. Mine only had the two spade connectors spare no diff lock light wiring. I think I have found a simple fix using the original harness.

Brilliant, out of interest what serial no does your transfer start with ? Mine is 41D (see pic). I've never managed to see (properly) if it has the threaded stud poking out the top of the plate with the 3 bolts in it. I do have the 2 wires hanging about under there ! Cheers.