Join Date: May 2010
Location: Williamsburg, VA
jbolty, a proper wiring harness is one off a gm 86 to 92 (and in some cases later) vehicle with TBI. You can pull the entire engine harness with connectors and all, plus the ecm. Since those engines were used on nearly every model of gm truck and car, there are literally tens of millions out there. If you don't want to pull the harness yourself, there are several ebay sellers that will do it for you and ship it to you. It will take a few hours to strip out some wires you won't use or need, and to splice any that you had to cut to get things out, but if you can follow colors and read letters and numbers it is simple and straightforward. Nearly all of the parts needed can be pulled from a single vehicle if you find one with a 4.3L engine, others are readily available at Napa, Rock Auto, Advance, O'Reilly, etc. Two things specific to the vehicle that need some sourcing are the throttle body adapter (and there are cad drawings and measurements out there if you have access to a milling machine) and the speed sensor. Many options depending on what your intake is and what connection you have to pick up speed. Generally for the speed sensor the easiest is JAGs that run (JTR) who has one that connects between the speedo pickup and the transfer case. I found everything without a hitch.