altenator

Smokey37 · Dec 15, 2016

My 9 n has a terminal that goes to the battery, also a two blade receptical on it. there are no wires to that.the amp showes no charge while running but my meter shoes a very slow volt gain.How can I test the alt., and or If I run the lights, the batt. looses charg that will not restaft the tractor. Can I test the alt., or does it sound like the battery may have a dead cell?

Bob Harvey · Dec 15, 2016

Um, sure. Best bet is to take the alternator to you local parts store and have them test it. THEN, Google 'JMOR's wiring diagrams'. HTH

rvirgil_KS · Dec 15, 2016

The large output stud on alternator should go through the ammeter, not directly to battery. If output cable does not go through ammeter you will see no charge indication.

It may be a "one wire" alternator that requires revving the engine to get it to charge.

You could also apply momentary 12 volts to #1 blade on the receptacle and see if that will make it charge.

Russ from MN · Dec 15, 2016

I'm no expert, but the battery should have over 12 volts before you start it, and then it should go to almost 14 at wot, simple diagnosis!

old · Dec 15, 2016

If it is a delco 10si it is easy to test if it is charging on the tractor if you have a volt gauge. Simply check battery voltage when it is not running which should be 12.3 give or take a little bit. Then start it up and you should get 13-14 volts give or take a little bit if it is charging. It should also at the 2 wire plug have a #1 and #2 terminal the #2 should go the the big stud where the wire goes to the battery and the #1 should go the to ignition switch the side that is hot when it is on. But if wired correctly like that and it is working likely you will need a diode or resister or light bulb in the #1 wire or you will not be able to shut the engine down due to alternator back feed

cole in mo. · Dec 15, 2016

To see if the alt is charging, with the engine running, place the blade of a screwdriver on the round metal center of the alt, if you get a good magnetic pull when you take it away, its charging.

old · Dec 15, 2016

Sorry but that is not true. All that does is tells you it has been excited but it does not tell you if it is in fact putting out the voltage it should be

John T · Dec 16, 2016

Correct, a good and full charged 12 volt lead acid battery should read around 12.6 volts (NOT 12.3 which is somewhat discharged) once stabilized and at rest subject to temperature. When connected to a good working charging source for some time period, it should raise to at least near 13 up to 14+ volts subject to RPM and battery and if an alternator or generator and its voltage regulation.

John T

altenator

Smokey37

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Bob Harvey

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rvirgil_KS

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Russ from MN

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old

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cole in mo.

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old

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John T

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