The charging problem caused Harley-Davidson to suspend production of the LiveWire electric motorcycle.
The company conducts tests to investigate the problem in what is seen as a major failure of the motorcycle manufacturer, according to the Wall Street Journal.
The company did not say when production would resume.
Harley was looking for an electric motor to help rejuvenate sales.
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The company asked customers and dealers to use only the professional type of charger that is available at their dealers, not electrical outlets in their homes.
Retail bikes for $ 30,000 are still safe to download.
LiveWire owners were able to charge their bikes using their standard wall sockets, although it could take 10 hours to charge.
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Harley DC Chargers
Harley is facing an aging problem among its core group of riders, so the company is introducing new bike models and looking abroad.
In 2018, 42 percent of Harley engines went to dealers outside the US
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In July 2018, President Trump quarreled with Harley-Davidson regarding a change of company overseas production in response to US trade policies.