I got this harness from a 2001 P/u with a 4.8 and 2wd. The harness had an extension to it that ran down behind the passenger head. Not sure what was in that packet of wires. It also had a couple other extensions that were cut. Take a look at the pics and let me know what these wires may go to. The harness does not have the starter wire circuit in it.
I am putting an LM7 into a 98 Tahoe. I may use the harness for the coil connectors and a few other things ad intergate it into my OEM harness with a 0411 ecm.













I think this ran down the passenger head behind the engine