tclederman - I have bench tested the starter per the service manual. I even have a growler and it tested fine on that too.
crenwelge - I have tried it with the battery in the vehicle, and with the battery on the floor with a pair of jumper cables. It is a good, 6 volt battery with a full charge. Yes, I did hook it up with a positive ground. You might be right about the amperage though. I'll try it again this evening, no jumper cables, battery in the truck. The battery cables in the truck, should they also be at least 4/0? I thought perhaps it was a bad ground, but settled on a short due to the sparking. I'll update with my results soon as a get in the garage.
Thanks!
