Thanks everyone. A few of you responded that the oil fill cap should be yellow. Yup, it should be. But, it isn’t. Hence the confusion. It’s always been serviced at Colton Truck Terminal Garage. So I may take it to them and have them do the next service; but only if they’ll let me watch.
I have a cousin in the auto sound/electronic biz and he can get me Interstate golf cart batteries for about $100 a piece. I’ll probably do that, even though 12v deep cycles are half that cost.
I'm gonna kick the jack issue down the road a bit for now.