Reason 1: there is no voltage between the positive and negative leads of the dial because the wire or connector is broken.
Processing method: reconnect
Cause 2: fat tire electric bike damage
Treatment: reshuffling the luminous tube
Reason 3: there is a breakdown on the dial board
Treatment: replacement of circuit board
Abnormal motor operation of voltage display lamp on instrument panel
Cause 1: Luminator damage
Solution: switch replacement
Cause 2: breakdown on dial board
Solution: replace circuit board
Reason 3: poor contact between dial lead and battery anode
Solution: reconnect