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the small black square thing next to the ign coil,


I believe that's the power transitor.


Yep, that appears to be the part that has failed. Connections look fine. Stealer is the only one that has this part and you must by the ignition coil along with it. $210 for both.

1991 Montero LS, fading red paint
Front and rear limited slip differentials
95 SR Rear Springs, torsion bar crank, 137,650 miles
33x12.5 ProComp Mud Terrains, Bushwacker Fender flares
3 litre V6 with new heads