The PO of my 1993 w250 4x4, automatic, air, bypassed the ecm. I'd like to return it to stock. From what I can see, ac still works, external voltage regulator, and the manifold heaters and OD are wired to switches on the dash. Im assuming that either the ecm went south or the crank position sensor and Im sure Ill have to fix that problem after the wiring is corrected, so does anybody have a wiring diagram?? Or any advice?? Thanks

 

In the "Sticky" there is a PDF file with a wiring diagram for a 91.5 with an ECM and IC. Should be the same wiring for 91.5 to 93.

 

I wonder why they went to all that trouble to re-wire everything without the PCM?

 

I know a guy that would do the same exact thing. He would rather spend an hour rigging something rather than spend ten minutes to fix it right.

 

Nope, the '91.5 is it's own animal and totally different from the '92/'93 setup.

 

Fair enough...I was just under the impression that the IC'd trucks were all the same...now I know.