luis_v,
i assume the truck worked before you changed the directional control handle?
And now it doesnt?
I'd double check the wiring at the plug where it plugs into the harness in the steering column.
Make sure the contact configuration is the same as the old one inside the plug connector.
Check the wire colors or number and make sure they are the same.
In other words, compare the two and make sure they are the same.
If there is a mfg part number on a label somewhere on it see if they match.

There could be more than one handle/switch assy that might fit on that truck for different control systems.

Could of just gotten the wrong one.

Let us know what u find out.

Laterz,