Ruff and tuff questions? New to carts

[Kingfish122]

I'm brand new to elec carts so i had no clue about ruff and tuff. I just purchased a 48v 2 wheel drive cart. The cart will not move at all forward or reverse. Motor has been checked its in perfect shape. Batteries put out 48 volts and all the wiring seems to be in good shape also. I'm thinking it might be the controller but I have no clue what kind its is. I have a couple questions any help would be appreciated thanks.

1. Where can I find the model numbers on this thing so I can at least know what year it is?
2. Is there a such thing as a service manual for this thing or a wiring diagram
3. Controller. The controller has no markings or stickers on it at all maybe y'all can help me to identify it. It's black with three terminals on the very bottom all inline. 2 plugs on it, one is a four and other is a 8. Also has two spade connectors. I've seen a couple that look similar to it but just want to make sure if they don't have to be exact or can any one with the same wiring setup work?