I too am a 6 volter that had the same issues as you mentioned. After any drive, I had issues restarting the truck. The issue was resolved with 0/0 battery cables. Once I installed these, no more issues.

Been running great for 6 years since.

SWEET
Sergeant At Arms: Old Dominion Stovebolt Society
BUNS?!?!?!Where we're going, we don't need no buns.....
1950 GMC 450
1951 Chevy 1/2-Ton
The GreenMachine
In the Stovebolt Gallery