I like the 1st advice..... however as far as I'm concern about your CC... it seems as if you have two (or more) problems. The tractor shutting down may be safety switches related such as maybe pto relays or seat switch. The other where the tractor slow to start is battery connections.... needs to nice, bright and tight. Including ground!
Check out the wiring diagram....scroll down to your model:
https://www.ccpartsnmore.com/cub-cad...V6mow52Yb6r0V_