[Shop-talk] Alternator terminals

[Dave Cavanaugh]

Our PE department got rid of a bunch of exercise equipment.  I pulled a 
nice commercial exercise bike out of the metal recycle and had the kids 
strip all the plastic off of it, and I found the guts of it are an 
automotive type alternator and a big resistor.  I want to hook it up as 
a current source for a battery charger/light bulbs/ammeter/something to 
give the kids an idea of how much actual work a KW is.

The alternator is a Mando 38611-101.   A picture of the alternator is here:

http://www.gympart.com/itemdesc.aspx?ic=LCA10

If you look at the picture on the link above and rotate it 90 degrees so 
the black plastic part is at 6:00, it has the following terminals:
On the black plastic part, "Ex" and "S".

On the main body of the alternator, clockwise from 8:00 the terminals 
are "L2", "P", "B" and "E".   There is also a ground terminal.

If you look a this chart,

> http://dasko.co.nz/articles/alternator-terminals-explained

It looks like all I would need to hook up to would be the "B" terminal 
and the ground and I can ignore the rest.

Do I have this right?

On an automotive alternator how fast does it normally have to spin to 
put out 12V?

Thanks
Dave








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