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Minneapolis Moline Tractors Discussion Forum
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5 star ALTENATOR

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RYAN BLAND

08-10-2005 08:55:33




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HOW WOULD YOU GO ABOUT WIRING UP A CHEVY 1 WIRE ALTENATOR ON A FIVE STAR, I NEED SOMETHING THAT WILL KEEP A BATTERY CHARGED




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Greasey Hand

08-12-2005 05:54:17




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 Re: 5 star ALTENATOR in reply to RYAN BLAND, 08-10-2005 08:55:33  
I have the wiring harnes made up they work on the GM alt. You just hook them to the alt & to the Ignition switch.



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Bob

08-10-2005 09:05:17




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 Re: 5 star ALTENATOR in reply to RYAN BLAND, 08-10-2005 08:55:33  
I assume you are referring to the common Delco 10SI or 12 SI alterantors.

Connect alterantor's the large output stud to the ammeter.

Make a jumper wire to connect the little terminal on the side of the alternator, marked "2" over to the large output stud. This is the voltage sensing lead.

Connect the #1 terminal to a source of power that is switched on and off with the ignition switch.

In this line, you must have a diode (1N5008 works great, end with white and towards the #1 terminal), or an "idiot light" with a #194 bulb (or equivalent).

If you do not use a diode or light bulb in the "excite" line to the #1 terminal, current can "backfeed" from the alternator into the ignition circuit, causing the engine to keep running when the ignition switch is shut "off".

(An oil pressure switch, or a resistor can also be used, but the diode or the "idiot light" are probably the easiest to obtain, and the cheapest ways to do this, and work well.)

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John T

08-11-2005 14:38:08




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 Re: 5 star ALTENATOR in reply to Bob, 08-10-2005 09:05:17  
Bob, I dont recall if you and I have ever discussed this??? but Ive read about and put into practice adding about 10 ohms of resistance into that excitation circuit as current limiting to protect the diodes. Sure, Ive done it n seen it done with no resistance and it works fine but it also works the same with that added current limiting resistance. You have any thoughts or good knowledge on the subject, it would take some study of the 10 SI unit to really get into it.

Thanks, John T

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Bob

08-11-2005 23:17:39




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 Re: 5 star ALTENATOR in reply to John T, 08-11-2005 14:38:08  
If no diode, "idiot lamp", or resistor is used in the "excite" circuit, and there is a poor connection in the "output" circuit to the battery, the alternator's output current will take an alternative path though the alternator's light-duty "diode trio", instead of the heavy rectifier, and the diode trio will get "toasted". I've seen that happen a number of times over the years.



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John T

08-12-2005 06:37:28




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 Re: 5 star ALTENATOR in reply to Bob, 08-11-2005 23:17:39  
Looks like we basically agree, regardless if either a diode (to prevent ignition backfeed) or an idiot light or resisitors or a combination thereof are used, they provide some degree of current limiting protection for the diode trio.

Take care Bob,,,,, ,,,, John T



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Kelvin

08-10-2005 19:53:01




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 Re: 5 star ALTENATOR in reply to Bob, 08-10-2005 09:05:17  
The above instructions work on an alternator from a junkyard.
If you have a rebuilt alternator with the 1 wire regulator, you just run that large output stud to the opposite side of the ammeter from the battery.

On your 5star, (if the wiring is not already butchered up)you will also need a wire from the same terminal on the ammeter that you hooked the alternator to the hot post on the ignition switch. This will replace the wire to the 'L' terminal on your generator.

You will also have to reconnect the battery - to ground to the frame and battery + will go the large post on the starter switch/relay (Whichever it has).

I have put 2 of these on, both produced a tiny spark at the cable when I attached it to the battery, but my digital ammeter did not detect any current. I assume it is a tiny, maybe temporary draw for that 1 wire regulator.

After 2 years, I haven't had any battery trouble with the jetstar3, and the pony probably wouldn't have given trouble either if it hadn't been parked all winter.

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