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How many volts do our Alternator excitors need to excite?

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How many volts do our Alternator excitors need to excite? by Ramsespride

Started on	: 08-20-2010 01:59 AM
Replies	: 6
Last post by	: theogre on 08-29-2010 11:39 AM

Ramsespride
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Report this Post08-20-2010 01:59 AM

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does anyone know what the voltage is for the alternator to become excited and to start producing electricity?

as i understand it is that voltage is passed from the dash light, thru the car, to the alternator and then the alternator will begin pumping out the power.

Im tinkering with an old engine on a stand and i might be on t oa cheap safe upgrade to avoid the stupis bulb is out battery dead thing...

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theogre
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Report this Post08-20-2010 08:53 AM

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Which alt?

Not just volt... Need some resistance in excit circuit. And some wiring diagram shows Diode too...
I forget what resistance...
Just use a new 194 bulb and it easy.

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IFLYR22
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Report this Post08-20-2010 10:11 AM

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I have seen resistance numbers from 33 ohm to 400 ohm. I used a cheap 330 ohm with good results. Others have put a 33 to 330 ohm in parallel to a light (if the light blows, the Alt will still charge).

-Dave

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Marvin McInnis
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Report this Post08-20-2010 11:04 AM

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quote

Originally posted by IFLYR22:

I have seen resistance numbers from 33 ohm to 400 ohm ...

Good numbers.

Think in terms of field current, not voltage. It takes very little field current (probably less than 1/10 amp) for the alternator to bootstrap itself into operation. The CS130 alternators don't even use the lamp circuit for field current.

[This message has been edited by Marvin McInnis (edited 08-20-2010).]

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Ramsespride
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Report this Post08-29-2010 02:04 AM

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well im still putzing around with the idea of a bypass of somesort. Anybody else have any input?

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Joe 1320
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Report this Post08-29-2010 10:38 AM

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These may help:

https://www.fiero.nl/forum/A...050119-2-055572.html

https://www.fiero.nl/forum/A...070315-2-073818.html

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theogre
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Report this Post08-29-2010 11:39 AM

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bypass?

Use a "one wire" alt or use a resistor if you won't use a light.

Make sure the Resistor can handle the wattage....

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

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