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Triple Jim · September 29th, 2019, 08:24 AM

Be aware that jump starting a motorcycle from a running car can blow the motorcycle's regulator. Jumping from a car that's not running is OK. The problem is that the running alternator in a car brings up the battery voltage to well over 14. The motorcycle regulator then tries to regulate that, but isn't designed to regulate a car alternator's high current output, so it fails.

Do AKA JacRyann's test immediately above this post and you'll know if the battery is at fault, which I suspect it is.

September 29th, 2019, 08:24 AM	#7
Triple Jim Guy Who Enjoys Riding Name: Jim Location: North Carolina Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot. MOTM - Oct '18, Aug '17, Aug '16	Be aware that jump starting a motorcycle from a running car can blow the motorcycle's regulator. Jumping from a car that's not running is OK. The problem is that the running alternator in a car brings up the battery voltage to well over 14. The motorcycle regulator then tries to regulate that, but isn't designed to regulate a car alternator's high current output, so it fails. Do AKA JacRyann's test immediately above this post and you'll know if the battery is at fault, which I suspect it is. Last futzed with by Triple Jim; September 30th, 2019 at 06:20 AM.