1999 SUBARU WAGON ON ENGINE START UP WHAT ...

1999 Subaru Wagon

Tiny

Nick Maple

April, 2, 2010 AT 10:27 AM

1999 Subaru Wagon

On engine start up what induces an alternator's magnetism?

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Tiny

racefan966

April, 2, 2010 AT 10:42 AM

It don't work that way. It takes 12 volts from the battery to excite the alternator if there isn't 12 volts to the alternator it won't excite and therefore will not charge. The black wire with the white stripe on the back of the alternator is the excite wire if this is a legacy outback.

Tiny

Nick Maple

April, 2, 2010 AT 12:57 PM

Ok, The standard rotor that spins inside an alternator contains an electro-magnet, which when energized creates a magnetic field inside the alternator creating AC energy. If that is correct, Would the power at start up that energize the rotor to create a magnetic field would it be from the 12 volt battery?

Thanks in Advance,
Nick Maple

Tiny

racefan966

April, 3, 2010 AT 9:03 AM

The power to energize the alternator comes from the black wire with the white stripe at the back of the alternator.

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