Y'all are right. It is a grounding problem... still haven't identified WHICH ground, but it is a ground. I found this out when I was tightening up the (-) on the battery and my ratchet hit the fender. I had the jumper wire 'attached' to the small terminal and the (+) post so I could get a reading.... well, when my ratchet hit, the engine started to turn over... of course it tried to weld my ratchet to the fender too... but at least I know it is a ground and nothing more serious right now.
After I got through tightening up the (-) cable, and removed the jumper wire, I was able to start the truck.... go figure.
Thanks for all your help so far!!!