I swapped the alternator in my C yesterday for a dry one, after having problems presumably due to a soaking the other got. When I finished making the connections at the alternator, I noticed that the "self-energizing plug" was getting hot. This happened before the tractor was started, and the switch was in the "off" position. I started the tractor and it started charging "normally". I shut it down and disconnected the battery. Obviously I have re-wired something improperly. What should I look for or check?
- Thread starter Rich V.
- Start date
Bob M
Well-known Member
Rich - Sounds like there may be an issue with how your alternator is connected. A couple questions:
How is the alternator currently wired - ie. how many wires are connected to it?
Can you describe the "self-energizing plug"? (That's a new one on me!)
Post back and we'll think it through...
How is the alternator currently wired - ie. how many wires are connected to it?
Can you describe the "self-energizing plug"? (That's a new one on me!)
Post back and we'll think it through...
John G. Hasler
Member
> I swapped the alternator in my C yesterday for a
> dry one, after having problems presumably due to
> a soaking the other got.
A soaking should not bother an alternator any more than any other piece of machinery with moving parts.
> dry one, after having problems presumably due to
> a soaking the other got.
A soaking should not bother an alternator any more than any other piece of machinery with moving parts.
Bob, one wire to alternator "BAT" terminal from ammeter. According to Jim at Agri-Services,the "self-energizing" plug is a resistor (which he measured at 148.6 ohms while we were just on the phone)looped on the two prong connector. He explained that this is what excites the alternator. One wire from the connector to the "BAT" terminal. I apologize for any misleading info or terminology, as I am ignorant to most things electrical. Thanks again.
Bob, one wire to alternator "BAT" terminal from ammeter. According to Jim at Agri-Services,the "self-energizing" plug is a resistor (which he measured at 148.6 ohms while we were just on the phone)looped on the two prong connector. He explained that this is what excites the alternator. One wire from the connector to the "BAT" terminal. I apologize for any misleading info or terminology, as I am ignorant to most things electrical. Thanks again.
Bob M
Well-known Member
OK Rich - you're set up is for one-wire alternator. But that "self-energizing" plug is a new one on me(!).
OTOH if that plug contains only a 148 ohm resistor it should NOT get even warm to the touch when supplied by 12 volts. This suggests perhaps the plug itself has shorted. You might try removing the plug and using VOM to measure the actual resistance across the plug terminals.
----
Incidentally I've met Jim at Agri-Services several times - he's a good man who knows his electrical stuff. Might be worth another call to him regarding your problem.
OTOH if that plug contains only a 148 ohm resistor it should NOT get even warm to the touch when supplied by 12 volts. This suggests perhaps the plug itself has shorted. You might try removing the plug and using VOM to measure the actual resistance across the plug terminals.
----
Incidentally I've met Jim at Agri-Services several times - he's a good man who knows his electrical stuff. Might be worth another call to him regarding your problem.
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