Re: 1991 Ranger 4x4 Button wont turn on
The TCCM, or transfer case control module is under the dash toward the floor; between the foot well area. If there's no center console then it'll be tucked up under the dash.
If the TCCM is shot, make sure you buy used. Even though a used one is a mixed bag in terms of reliability, it's 2/3 less than the cost of one through the dealer. A dealer TCCM is no better than going used in terms of future reliability, and you'll save a couple hundred bucks in the process for the part.
Worst case is that the transfer case itself is on its way out, hence it won't engage.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!