Two Yamaha G22E bucking, surging, etc

[itstheburns327]

Ok so here's an issue I have with 2 2003 G22Es. One is stock and the other I installed a 500a Alltrax controller programmed for the stock motor at the moment, HD solenoid, Admiral motor, 1/0 battery cable throughout, all brand spankin new. The other one is stock with a new solenoid, speed sensor and throttle sensor. When I step on the accelerator, both carts jerk and buck, sometimes not moving at all no matter what throttle position I'm in. No matter what, I cannot get either cart to start and operate smooth. The solenoid clicks and stays on while the pedal is depressed. The cart will sometimes creep then have full speed, stop and then start slow, buck, rinse and repeat no matter where the pedal position is. This is all random and unpredictable. I really have no clue what else it could be. I still have to go through the Admiral motor break-in process so the sudden and hard starts are less than desirable. I've checked for broken and loose wires throughout the harness. The stock cart, I'm thinking controller but I'm not sure. I have the stock controller from the upgraded cart to use for testing in the stock cart. All my batteries are good and charged, ALL of my connections are clean and tight, batteries, motor and solenoid. I've reprogrammed the Alltrax controller to stop reading from the speed sensor to see if it was bad or had a weak connection but had no change. I'm really at a loss as to what else could be doing this. Any help or suggestions to what I may be missing would be greatly appreciated

[cgtech]

Check for consistent voltage with no "dropuouts" at the gas pedal switch. That could indicate a bad pedal switch or bad tow/run switch.

[itstheburns327]

Thanks for the quick reply! I figured out whats wrong with the G22 with the alltrax controller. The controller is shutting down on Overtemp. I think the thermal sensor is bad since its reading 31c at rest and then spikes to 220c when I jump on the cart and try to drive. The spikes in temp are consistent with my bucking issue so this may be the problem here. The controller is ice cold and not burning like a volcano, haha.

AHHHHH the tow/run switch! SOB I didn't even think to check that one. I will recheck the stop switch and tow/run switch and report back.