Installing one wire alternator

This is one of those love/hate things. Single wire alternators are utter simplicity from a wiring standpoint, one wire to the battery terminal and you're done. Down sides are that typically they take more rpm to begin charging and as 67Dart273 points out, they maintain a specified voltage at the alternator terminal, not at the system level. Some of my friends have used them with some success on cars but I think the level of success is on a case by case basis. I really like them for equipment that typically runs at a relatively constant rpm (generators, agricultural tractors, water pumps, etc.).