Jeep CJ8 Scrambler 5.9L Engine Wiring Harness - Project Scratch-Built ScramblerPosted in Project Vehicles on January 1, 2010
Late-model engine swaps and their control systems are notorious for being complicated nightmares. Due to advanced electronics and the seemingly endless mazes of wiring, relays, fuses, and emissions components, figuring out an engine conversion can literally take days and even weeks. Once the swap is completed, if one critical wire is overlooked or misconnected the rig will never run at peak performance levels.
We stumbled around in the engine bay of our CJ-8 as we attempted to install a salvaged factory harness and ECM on the Jeep's 5.9L engine. The wiring and computer were scavenged from a '98 Jeep Grand Cherokee that was fitted with the Magnum V-8. To our chagrin, our harness was missing a number of critical plugs, wires, and relays. Also, cutting apart the wiring loom while trying to trace the wires with a factory manual was extremely time consuming, and not a heck of a lot of fun!
Not wanting to spend months on wiring the Scrambler, we took the easy way out by calling Chris Squire, owner of Hotwire Auto. He builds complete "hot rod harnesses" (wiring harness control systems) for late-model engine conversions. About a week after sending him the pieces of our factory wiring harness and ECM (computer), we received a new one that looked better than factory. Every wire and plug was labeled exactly were it should be connected. Wiring up an engine swap doesn't get much easier than this!