SOURCE: need vacuum diagram for 4-wheel drive
the 4x4 don't use vacuum. the front is auto lock when the transfer is engauged with the button. if the light don't which when pressed into 4hi or 4low. the motor on the transfer case maybe hung up. they have to be used at least 4 times a year not to go bad. the motor is on the back side of the transfer case. best of luck.
SOURCE: 1987 Ford Ranger 2.0 Liter Vacuum Line Diagram
can you see the diagram under the hood? if not try searching a junkyard for either the diagram or a complete motor
Fig. 14: Vacuum hose routing-1987 2.9L engine - zoom link here
Fig. 13: Vacuum hose routing-1987 2.3L engines - zoom link here
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