Dangling Alternator Question

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Subject Author Date
Dangling Alternator Question loa13mbb 11-04-2008
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Posted by on November 4, 2008, 6:28 pm
So I'm having problems with my voltage rectifier. In the meantime I'm
leaving it unconnected, and charging my battery at night. My question
is this: because the voltage rectifier is unconnected, the alternator
is now dangling (not outputting into anything). Is this harmful to
the alternator or just plain dangerous?

Posted by Mark Olson on November 4, 2008, 6:47 pm
loa13mbb@gmail.com wrote:
> So I'm having problems with my voltage rectifier. In the meantime I'm
> leaving it unconnected, and charging my battery at night. My question
> is this: because the voltage rectifier is unconnected, the alternator
> is now dangling (not outputting into anything). Is this harmful to
> the alternator or just plain dangerous?

It won't hurt anything or anyone so long as you keep the wires
from touching anything. Wrap some tape over the ends of any
unconnected wires until you replace the regulator.

What make, model, and year is your bike?

Posted by on November 4, 2008, 7:10 pm
> loa13...@gmail.com wrote:
> > So I'm having problems with my voltage rectifier. =A0In the meantime I'=
m
> > leaving it unconnected, and charging my battery at night. =A0My questio=
n
> > is this: because the voltage rectifier is unconnected, the alternator
> > is now dangling (not outputting into anything). =A0Is this harmful to
> > the alternator or just plain dangerous?
>
> It won't hurt anything or anyone so long as you keep the wires
> from touching anything. =A0Wrap some tape over the ends of any
> unconnected wires until you replace the regulator.
>
> What make, model, and year is your bike?

It's a '97 BMW F650. And yes, I made sure that alternator wires were
cared for. Thanks for your response.


Posted by Rob Kleinschmidt on November 5, 2008, 1:55 am
On Nov 4, 4:10=A0pm, lneu...@gmail.com wrote:
>
> > loa13...@gmail.com wrote:
> > > So I'm having problems with my voltage rectifier. =A0In the meantime =
I'm
> > > leaving it unconnected, and charging my battery at night. =A0My quest=
ion
> > > is this: because the voltage rectifier is unconnected, the alternator
> > > is now dangling (not outputting into anything). =A0Is this harmful to
> > > the alternator or just plain dangerous?
>
> > It won't hurt anything or anyone so long as you keep the wires
> > from touching anything. =A0Wrap some tape over the ends of any
> > unconnected wires until you replace the regulator.
>
> > What make, model, and year is your bike?
>
> It's a '97 BMW F650. =A0And yes, I made sure that alternator wires were
> cared for. =A0Thanks for your response.

I think you've got a permanent magnet alternator with
a regulator/rectifier combo. In that setup, the regulator/
rectifier has to dissipate unused current as heat rather
than de-energizing an electromagnetic rotor.

For a permanent magnet setup, I'm not sure about leaving
the R/R completely disconnected. electrexusa.com is a
good resource. I'd also recomend the beemershop in
Scott's Valley, Ca as a pretty good source of advice and
online parts.

Posted by Mark Olson on November 5, 2008, 5:56 am
Rob Kleinschmidt wrote:

> For a permanent magnet setup, I'm not sure about leaving
> the R/R completely disconnected. electrexusa.com is a
> good resource. I'd also recomend the beemershop in
> Scott's Valley, Ca as a pretty good source of advice and
> online parts.

Not sure what would be hurt by leaving the stator disconnected
on a PM alternator. No power would be generated since no
current would be flowing in the windings.

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