Hey Glenn!

Since I have the same kind of truck I could follow exactly what you were doing! It's good the old guy starts well again. Have you got some really good cables on that battery? I was having trouble with mine not wanting to spin the starter fast enough.
I got some welding cable and made two 30inch cables up. I attached the ground to the starter mount bolt and the positive to the connection on the starter. Boy, does she spin over now!! 6volts likes that heavy duty cable!

Seasons Best George