Do what??????? 3 golf batteries? sensitive? yes as most electrical things are and especially cards and choppers. The unit should have a pump cut card located on it. Do this.......... back probe the positive and negative cables off the batteries with volt meter and when driving it under load ( hard accel) what do the volts drop to? The hydro pump will be the big energy user Approx 350 amp dead headed. I am not sure what AH rating those batteries have but it isnt helping the situation. It will be hard to diagnose problem without proper battery and amp hour rating. Never seen a set up with golf batteries before on a sitdown rider as such. I am suspecting unit is dropping contactors due to low voltage as the golfers cant keep up. The golfers are cannot maintain a constant and reliable voltage range due to capcity is what i am thinking. You do not want more than 3 to 4 volt drop when accelerating. The pump cut card works by kind of averaging the voltage and going into cut. Let me know what the voltage drops to. There sould be a switch on dash thats marked power /eco. Perform the test set on power.