Is a series or regen cart? A regen cart will have a wire that comes out of the end of the motor along with A1,A2 and S1,S2 terminals. A series cart just has the A1,A2 and S1,S2 terminals on the motor.
If it is a series cart you can go with an Alltrax AXE type controller
A buddy of mine has a 2001 G16e and he blew his controller. I put an Alltrax AXE 4844 in his cart and he loves the torque upgrade.