47-55.1 Battery charging issues

[pvienneau]

Hello all, took the 49 6 volt out this past weekend because had some work to be done. I was able to start up with a little either and choke. Once started I moved her out of the garage. After all warmed up I shut the engine off. When I went to restart the engine it wouldn't start. Starter turning slightly then dead. The battery is brand new and I even had it tested. So I put the charger/starter on the battery and it started right up. I took it for a ride and when I stopped the truck I shut it off. Went to restart it and again like the battery was dead. So I hooked jumper cables from a 12 volt car and it started right up. What are my next steps? How do I test the generator and voltage regulator? Thanks