My display comes on for a second then disappears and won't come back on, what's wrong with my bike. 48v, older bbshd. It worked perfectly and now this
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See if you can power on the bike with the charger. If you can bypass the battery and power on the bike you know the battery is the problem.
https://youtu.be/QSy_Ufl3BUM
Same concept as this. How easy or difficult this would be for your charger/battery depends on the connectors on it but even barrel's not that hard, you can get a reverse barrel to xt60 here for example https://www.ebay.com/itm/203078481633 or xt60 female to xt90 female here https://www.ebay.com/itm/203078513528
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