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It can be done, and sometimes that is your only choice. My only recommendation is to only jump off the battery and not with the vehicle actually running. A car/truck electrical system is still 12V, but it runs more amperage than our Harley electrics. At least going off only the battery you can limit the risk.
I should add that a lot of the "old school" wisdom is still passed down. Harleys used to run a 6V system when cars werea 12V system and back then you really could burn out the electrical system by jumping off of a car/truck.
I second the idea of not having the car/truck running. A buddy of mine blew out his charging system doing this. You can also push start your bike (put it in 3rd gear) get a roll, then pop clutch.
Take all the usual safety precausions etc.
Watch for grounding,,,same as usual...and it
should be just fine...I use a portable battery pac
just for a little more control over the situation....
Jumping from a cager battery is fine. Do Not have the cage running. Preferable method is to attache cage battery neg cable to a frame ground and as you start the bike, touch the cage pos cable to the bike battery pos terminal.
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