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Ford 9N, 2N & 8N Discussion Forum
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Exciter wire on an alternator?

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New8Nlover

11-02-2005 19:53:12




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Which wire is the exciter wire on an alternator? I am converting my 6 volt to 12 volt and am going to wire the exciter wire to the ACC on the ignition. But I don't know which wire is the exciter wire and I can't find one of those handy wire harnesses that are pre wired. Please help...soon, since the 6 volt died and I don't have a generator...




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K.LaRue-VA

11-02-2005 21:41:26




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 Re: Exciter wire on an alternator? in reply to New8Nlover, 11-02-2005 19:53:12  
Don"t forget to put a diode in that line or switch it separately from the coil. If you use a diode, connect it to only allow current to flow towards the alternator. If you try to use the same switch for ignition and the #1 field (exciter) wire without a diode, the engine will continue to run when you turn the key OFF.



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roger 40 9N

11-03-2005 07:36:44




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 Re: Exciter wire on an alternator? in reply to K.LaRue-VA, 11-02-2005 21:41:26  
If he is using the ACC terminal on the ignition switch a diode is not needed since the ACC and ignition are not connected when the switch is off.
Iffn you're using a simple on/off switch a diode or some other way of isolating the excite from the ignition is needed.

Roger in Michigan.



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Phil (Nj.AZ,Sask)

11-04-2005 02:02:56




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 Re: Exciter wire on an alternator? in reply to roger 40 9N, 11-03-2005 07:36:44  
[quote}If he is using the ACC terminal on the ignition switch a diode is not needed since the ACC and ignition are not connected when the switch is off.[quote)

That is not actually true... The fact that the tractor will turn off does not mean that the alt is wired or working correctly.

If you Connect the Excite Term via "any" switch directly to the Battery then the Excite Voltage to the regulator will "Equal" Battery Voltage "at all times".

Once the Alt has started charging the regulater "SHOULD" use the voltage from its internal diode Trio (seperate Voltage output from the ALT)

When you directly connect the EXCITE Term to the battery (via ANY Switch Contact) you defeat the reason for the seperate diode Trio output. The Internal Regulater Voltage (excite) should vary above & below battery voltage (load dependant)

The addition of an "External" diode will block the internal Alt Excite (diode trio) voltage, from the battery, and allow it to independantly control the Regulator. In an ideal world a small resistor would also be installed in series with the Diode to allow a lower charge rate.

JMHO

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K.LaRue-VA

11-03-2005 11:10:58




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 Re: Exciter wire on an alternator? in reply to roger 40 9N, 11-03-2005 07:36:44  
Roger is correct, my 8N just has the original type single contact ON-OFF key switch. There is no ACC terminal on mine, so I had to get creative.



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Bob

11-02-2005 20:36:07




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 Re: Exciter wire on an alternator? in reply to New8Nlover, 11-02-2005 19:53:12  
If you are referring to the common 10SI or 12SI Delco alternators, the terminal marked "1" is "Excite", and the terminal marked "2" is "voltage sense".

If you are using another alternator, you'll have to clue us in as to what you're working with.

Link

http://www.madelectrical.com/electrical-tech.shtml



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Kelly Harris

11-04-2005 07:55:35




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 Re: Exciter wire on an alternator? in reply to Bob, 11-02-2005 20:36:07  
Some alternators can be made into self exciting. I had one done for $15 at a local alt/ starter shop. The last one I had would self excite once high RPMs were reached and then it would continue at any throttle setting until I killed the engine.



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