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.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!