[alchemy]

waiting til an expert comes along but in my short experience I did have trouble with the switch and it's a very simple device that seems nearly fool proof except for physical damage or the points possibly burning. On mine the case just unsnapped some making the contacts not touch well. I doubt it would make it "buck" and seems a slower process than "bang on and bang off" from there. I'd guess it would be more in your main power somewhere from the batteries to the motor including relays, solenoids, etc, maybe even a loose battery cable. A loose battery cable will get hot, dangerously hot even but let's wait to see if someone who knows these carts comes along.

oops, for some reason I just assumed you had one of those black plastic rocker switches on the dash like I have, not sure what you have