No 1 rule with any equip- clean ALL connections, then run each motor thru amp meter to see current- if 1 higher amps than other, pull apart- check for shorted turns/ bad brushes- repeat with other motor to see if can get amps to match-if not, probs! The controller can be a major source of probs- if bad drive has caused probs. Unless can get makers' spares- trouble! Sometimes, key/switch contacts are a prob-as also throttle. Generally a waste of time to stuff around with these if seems expensive/ intractable probs.I, in the distant past, actually made a r/p controller for a 24v scooter- still have it!!! Cheapskate cuss didn't want to pay me $100- when orig controller was $500!!!
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