More than likely it has a bad battery or cell in the battery even though it shows a full charge. Once under a load the power drops below 17 volts which shuts the unit down momentarily. Then when it powers back above 17 volts because you have the throttle partially depressed it trips the code 6. Have the batteries load tested and you will see one is bad.
Solution: new batteries
Hi a load tester will give u an accurate reading on there condition available on E/BAY COST APROX $35 ...test one battery at a time tester is 12 Volt :::::With a car battery u can check each cell separate with a Hydrometer..your batteries r sealed : u can't use one .cheers
Hoping your problem is in the wiring to and from , or the light itself , usualy when the board goes , nothing works... make sure you test every contact point for juice to and from , before you discard the possibility...!!!!
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I'd be looking at the motor controller first. Since you don't have any flashing leds to indicate a problem, perhaps the brushes on the motors need replacing.
