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Tool Talk Discussion Forum

battery jumping

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c.r

04-05-2007 15:42:52




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I jumped the battery on my motorcycle, with a full size pickup battery. My buddy said i was puting to much amperage thru it and will burn up the starter. I said it did nt matter as long as they were both 12 volts. Whose right??




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frankiee

04-06-2007 08:36:13




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 Re: battery jumping in reply to c.r, 04-05-2007 15:42:52  
Boosting can always be a risk on the electrical systems finer electronic components.
But not the starter.
Cranking with low voltage is bad for starters.
With 12 to 14.5 volts the starter will only take what it is designed to take.
Think of it this way.
A tv set pluged into a 1000 watt protable generator powered by a 5 HP Honda engine and another TV pluged into a wall outlet powered by four 3 million HP nuclear reactors.
No difference.
If anything is bad for the TV would be the generator not being able to put out enough power with other loads being added such as lights and the voltage dropping and being unstable.

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Gerald J.

04-06-2007 11:35:35




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 Re: battery jumping in reply to frankiee, 04-06-2007 08:36:13  
A DC motor is not like an AC motor. The DC motor doesn't take more current at low voltage, it takes less and produces less power and runs slower. Its speed is not constrained by frequency like an AC motor that with low voltage draws extra current because since the AC frequency pretty much sets the speed, the external load sets the shaft load and it takes more current at low voltage to make the torque and so the power.

Gerald J.

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IowayIHC

04-05-2007 19:34:59




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 Re: battery jumping in reply to c.r, 04-05-2007 15:42:52  
We jump started our Honda 4 wheeler. After that the thing would run for about 5 minutes, die, wait 10 minutes and run for 1 hour, die, sit for 10-15 minutes and run for 20 minutes. Finally took it to the dealer, he checked it out. It started and ran for some time, then quit. He ask me if we had ever jump started it from a car or tractor. YUP. $115. dollars later it runs great...NO more jump starting it from a larger 12 volt battery. What happened was, it burned up a some deal under the hood, about the size of a pack of cigarettes...It up to you do what you like.

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Gerald J.

04-05-2007 16:09:33




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 Re: battery jumping in reply to c.r, 04-05-2007 15:42:52  
Won't hurt the starter, might expand the case on the motorcycle battery rapidly (e.g. explode) from too much battery charging current. Thin wire in the jumper cables can limit that charging current.

Gerald J.



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buickanddeere

04-05-2007 15:47:31




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 Re: battery jumping in reply to c.r, 04-05-2007 15:42:52  
You are. Just make the last connection to chassis. Don't make the last connection directly to a battery post. An arc near a battery can = Boom.



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c.r

04-05-2007 15:55:48




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 Re: battery jumping in reply to buickanddeere, 04-05-2007 15:47:31  
excellent, Thanks



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tx68

04-05-2007 18:49:29




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 Re: battery jumping in reply to c.r, 04-05-2007 15:55:48  
Make sure jumping vehicle engine is not running.
Some motorcycles have total loss alternator regulators. They dump the extra power into a heatsink when the voltage in the system gets to a certain point. If that point is less than what your
jump truck is,it will try to put the capacity of your big alternator through the little bike regulator unit which may overload it causing dammage.



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