Posted by dzaremba on May 7, 2007, 4:56 pm
I left the parking lights on last night on my BMW R1150RT and now
there's not enough juice left to start the bike.
Is it safe to jump start my motorcycle battery from the battery on my
pickup truck?
If so, is the procedure any different than that for jump starting a
dead car battery?
Don
Posted by Broderick Crawford on May 7, 2007, 6:13 pm
dzaremba@gmail.com wrote:
> I left the parking lights on last night on my BMW R1150RT and now
> there's not enough juice left to start the bike.
> Is it safe to jump start my motorcycle battery from the battery on my
> pickup truck?
> If so, is the procedure any different than that for jump starting a
> dead car battery?
>
> Don
>
It shouldn't bother putting a 12 volt battery in parallel with a dead
one. Although, if there is something wrong with the dead battery it
could explode.
Posted by Project Magnet #1 on May 7, 2007, 6:56 pm
dzaremba@gmail.com wrote:
> I left the parking lights on last night on my BMW R1150RT and now
> there's not enough juice left to start the bike.
> Is it safe to jump start my motorcycle battery from the battery on my
> pickup truck?
> If so, is the procedure any different than that for jump starting a
> dead car battery?
Don't start the truck.
Les
Posted by The Older Gentleman on May 8, 2007, 6:37 am
> dzaremba@gmail.com wrote:
> > I left the parking lights on last night on my BMW R1150RT and now
> > there's not enough juice left to start the bike.
> > Is it safe to jump start my motorcycle battery from the battery on my
> > pickup truck?
> > If so, is the procedure any different than that for jump starting a
> > dead car battery?
>
> Don't start the truck.
>
LOL!
What he said :-)
--
BMW K1100LT 750SS CB400F CD250 Z650 SL125
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
Posted by Albrecht via MotorcycleKB.com on May 7, 2007, 7:13 pm
dzaremba@gmail.com wrote:
>Is it safe to jump start my motorcycle battery from the battery on my
>pickup truck?
Yabbot, it's easier on the electrical system if you just disconnect the
battery and recharge it with a
slow charger.
>If so, is the procedure any different than that for jump starting a
>dead car battery?
Yes, you need to disconnect the jumper cables just as soon as the motorcycle
starts so the
motorcycle generator won't try to charge BOTH batteries.
About the worst thing you could do is try to jump start a motorcycle with a
weak car battery, thinking
that nothing can come of it.
Gawd only knows what amperage the power diodes in the rectifier are rated at,
but you might be putting 40 amps through them, trying to charge two batteries
with the cables still connected.
There is an old wives tale that never seems to die. The tellers of OWT's say
that if you hook the
jumper cables from a fully charged car battery to a discharged motorcycle
battery, the car battery will quickly charge up the motorcycle battery
because it has so much more "juice" available.
In truth, a fully charged car battery at rest may only be putting out about
12.8 volts.
If the motorcycle battery is discharged down to 12 volts, the difference is
only 0.8 volts. It would take
about 20 hours to charge up a 16 ampere hour motorcycle battery from a car
battery.
You could slow charge the motorcycle battery faster using a car charger on
the 2 to 3 amp setting.
--
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http://www.motorcyclekb.com/Uwe/Forums.aspx/tech/200705/1
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> there's not enough juice left to start the bike.
> Is it safe to jump start my motorcycle battery from the battery on my
> pickup truck?
> If so, is the procedure any different than that for jump starting a
> dead car battery?
>
> Don
>