yo SGT.,
Check build Year of your Bronco; see it on driver side dor jamb label; this may be a clue;
In Four Wheel Drive (4X4) General Information, Operation & Troubleshooting TSB 92-1-8 for Bronco, F Series & Ranger (COMPLETE); Includes Electric Shift On The Fly (ESOF) Troubleshooting & Hub Operation; same for 87-96; exc for that in 87; power from Fuse 6 (15 amp) to "ELECT SHIFT CONTROL MOD" WHT-PPL and CB 12 (30amp) to "ELECT SHIFT CONTROL MOD" BLK-WHT; SEE A7 and A8 in the 4x4 diagram, it shows those two wires BLK-WHT as BK/W from SHIFT MODULE to P1 BATTY and and WHT-PPL as W/P to P2
Source: by Ford via Chilton
Page 8
"TOUCH DRIVE - NEW ELECTRONIC CONTROL MODULE FOR 1991
A new electronic control module has been installed on the
1991 model Ford trucks with "Touch Drive," built after 8/6/90. The new module features a different computer logic to control shifting.
With the previous module, it was possible for the driver to select 4L directly from 2WD. However, the control module actually shifted the vehicle into 4H first, then checked to see if the vehicle was stopped and that the automatic transmission was in neutral (or the manual transmission clutch was disengaged). If these conditions were not met, the actual shift wouldn't take place. Instead, everything would be made ready for the moment when the shift could be completed. This was called pre-staging.
During pre-staging, the Low Range light flashed. This confused some customers. In addition, pre-staging and the flashing light sent confusing signals to the new E4OD transmission's electronic controller.
The new module solves both these problems. With the new logic, if the driver selects 4L when in 2WD, nothing will happen, because the transfer case controller ignores the 4L signal. The driver must make the shift to 4H first, then (while stopped) shift to 4L..."
Next is to drop by (better than calling) local dealer and ask them to see if they can find compatible years and models that use same Module;
Ford did have the Interchange Guide on-line @
http://www.fordparts.com
but it got fouled up during an "upgrade"
I went thru the search drill, but no-go for the Module
For a YARD SEARCH on-line, I use;
http://www.mypartshop.com/
Select All Parts
year, etc, then FORD TRUCK
or
http://www.copartfinder.com
Has Vehicle Pics!
http://www.picknpull.com
http://www.car-parts.com
Most yards can help w/Hollander Interchange Guide
