It seems as if a lot of people have troubles with this indicator. Three places you can check:
A: Bulbs (easy )
B: The "Automatic Free-Wheeling Hub Indicator Control Unit". This is found beside the glove box on the side of the vehicle. (Best found by removing the glove box entirely). It is a black unit above the green relay which controls the rear defrost. Unless you have an extra indicator control unit, this is a difficult one to check, unless you can see visible signs of failure (i.e. leaky windshield allows water to penetrate unit).
C. The Pulse Generator:
This is on the transfer case, to the right of the output shaft, identifiable by the wiring harness plugged into it (should have a black/white wire and a black wire connecting it). A single screw connects it to the T-case, and under the lip is an o-ring. It is only a small piece, about the size of a typical "temp sensor" etc. Check the resistance across the terminals (you should be able to do this without removal). Should be 215-275 ohms (according to manual, or else it's faulty.
If you check these three areas, you SHOULD find the reason why the hub lock indicator light is not coming on.
the Montero-Raider Website http://www.geocities.com/baja/cliffs/1976/
89 V6 Raider: Terzo rack,Hellas,factory LSD,CB, 12disc CD.]Soon to be added:31"BFGs,Bilsteins,2"lift [IMG]http://www.geocities.com/Baja/Cliffs/1976/signature.jpg[/IMG]
93 Pajero 2800 turbo diesel: "Ol'Betsy #5"