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Not a good idea to boost a bike with a car/truck battery. Better to charge the bike with a charger.
+1
trying to charge a duff/discharged battery with the charging system may strain the charging system beyond capacity and damage the voltage regulator or the stator ( or both).
figure out another strategy to get going
it is possible to grab another battery and some cables and wire up in parallel to get going- clumsy but it works...easier with the old saddlebags where the lids came all the way off
Made a set of jumper cables to work with the plug for the battery tender one has plug and battery clips the other has plugs on both ends you can roll them up and hold in your hand they wont start a bike right away but let charge for a few minutes to build battery up and bike will start
The the fuel pump, ACR's, and the ECM won't work with a dead battery. So I don't think push starting will work unless you can get it going fast enough to generate enough voltage to get all the electric stuff working. And even then I'm not sure it'll start.
Those of us who are rebels and operate in defiance of the MSF use the big master switch to shut down don't have problems of dead batteries after lunch. When one poops out totally it is the same for everybody.
I was talking to the guys at my local shop, and bump starting came up. Their reply was the 88's and some 96's were ok to bump start. However these 103's & 110's will bend your crank trying to bump start em. just what they were telling me & I have no reason NOT to believe what they say. Everything they have done to my bike or told me how was spot on.
Something to think about...
Best to take care of the battery - use a trickle charger / tender for winter storage. Just leaving the battery over the winter will tend to sulphate it and once that progresses all you have is scrap.
Hope the Harley batteries are better quality than the run of the mill. On other brand X bikes the last times I had to get a new battery, it took 2 to 3 to finally have one that worked.
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