If Your Battery Is Low (Or Dead) - Honda GL1800 2004 Owner's Manual

If Your Battery Is Low (or Dead)

Jump starting is not recommended, especially if you use an automobile
battery. The greater amperage of an automobile battery when the car
engine is running can damage your motorcycle's electrical system.
Bump starting is also not recommended.
If you can't charge the battery or it appears unable to hold a charge, contact your
Honda dealer.
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Taking Care of the Unexpected