Welcome!

I'm assuming the 3.0l transfer case is the same as the one in my 2.6l, because I don't see anything in the FSM about two different ones.

On the the side of the transfer case are 2 switches, and on the rear is a pulse generator. The 2 switches control the dash lights for the 4x4 on indicator, and are wired in series. If either one is bad, or if the connectors have separated, or if any of the wires coming out of the either switch are broken, the 4x4 indicator will not go on. Then, of course, the indicator itself uses a bulb which can burn out.

The pulse generator on the rear is used for the "hubs engaged" light, and I'm not entirely sure how that system works.

Last edited by GrantCee; 10/11/18 10:58 PM.

1987 Montero SWB, 2.6L, 5spd
Weber conversion
2-valve head from Engine Machine Service
"4G54 FTW!"