I have the pleasure of repairing and maintaining a 2015 Bobcat 3650 with a Kohler engine. This thing has non stop problems and we are close to trading it in. I now have most of the problems fixed except the charging system. When the engine is first started, it will not charge until it is driven. It will sit and run on only battery until it is down to 8 volts or so. It doesn't matter if it is at idle or high engine speed. Our local dealer isn't much help. They replaced the alternator a few months after we got it but it still has issues. Does anyone have a similar problem or is this the way they are? I have never experienced a charging system that doesn't start charging as soon as it is started. Thanks for the help.