What will cause battery to drain when operating but stay charged when engine is off is the back firing and cutting out and dying related
Battery is being drained as it operates and not taking charge
check tightness and clean both terminals and cables
how old is the battery
may have a dead cell ..wont take charge
check the charging input to the battery with a volt meter
has to be above 12 volts
if lower or equal to 12 volts ...no good
the charging stator inside the engine needs testing or repair or replace
stator is another word for an alternator or a generator
why it plays up
best guess the ATV if a 12 volts system wont run on 11 volts
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