I do not have an alternator but carry a jump pack with me, because there is nothing worse than a dead battery.
When I first bought my conquest I took it out running the lights and brake fan all the time, first trip the battery started to die on me. I know very little about the thing at the time. Once I charged up the battery, I have been good to go since with no problems but i always like to be prepared.
I spent a full 8hrs trying to pull out my buddies mudd ox out of a creek, Between the lights and running the winch frequently, I was ok didn't have an issue but I would put it in neutral and rev up when we were doing something else,
2003 Argo Conquest
Wasilla, Alaska