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12v to field post on 6v generator??

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Darren in TN

03-15-2004 07:47:17

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My Farmall Super A was converted to 12v before I bought it. It had a coil with external resistor, and when that died this weekend I replaced it with a new 12v coil (that is, one that doesn't use a resistor.) When I wired it up I failed to notice that the field wire to the generator came off the + post on the coil after the resistor (and therefore would have only had 6v or 8v to it.) Anyway, I wired it back to get 12v without realizing my mistake and ran it for a while (about 5 minutes.) I shut it down when the generator started smoking a little. (It's a newer three-wire Delco.) Did these use internal voltage regulators or did they rely on resistors to control the voltage output? Thanks in advance, guys.

Darren

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Jon H

03-15-2004 09:54:38

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Re: 12v to field post on 6v generator?? in reply to Darren in TN, 03-15-2004 07:47:17

Do you mean 3 wire Delco 10 SI alternator? If so the regulator is internal. The alternator/regulator exciter wire(#1 marked on alt case) will excite the alternator just fine with either 6-7V after the resistor or with full 12V without a resistor. The sense wire(#2 marked on alt case) in the regulator plug senses the voltage in the electrical system and is what controls charging voltage. The #2 wire is normally connected to the BAT stud on the rear of the alternator so the voltage reading is taken right at the alternator output. A disconnected or poor connection in the #2 sense wire will cause the alternator to charge flat out with no regulator control and will get it hot enough to burn out pretty quick. Also a failed regulator(rare) will cause them to charge too hard. With the tractor running fast,the voltage measured at the battery posts should not exceed 14.5-15 volts.

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Darren in TN

03-15-2004 10:48:58

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Re: Re: 12v to field post on 6v generator?? in reply to Jon H, 03-15-2004 09:54:38

John,
Thanks for the great info. I'll tear into it tonight and see if I can make heads or tails of it. I'm replacing a lot of old wiring and bad connections, so I wouldn't doubt that the sense wire was bad.

Thanks,
Darren

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