by Mark Nixon » Tue Mar 05, 2013 5:02 pm
1991.5s have the cruise module in the ECM behind the battery.
As it stands, it looks like all you need is the cruise servo, which is mounted to the fender.
If you hook it up, be sure to check to make sure there is a fuse in the fuse box.
At the age of these trucks, it would also not surprise me if the clock spring under the steering wheel is bad when you get it all sorted out.
Mark.