'76 Longstripe with Ballast resistor

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staninlowerAL
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'76 Longstripe with Ballast resistor

Postby staninlowerAL » Wed May 13, 2015 7:54 pm

I got a closer look at under the hood :o and found a ballast resistor bolted on the rear of the alternator as shown in the pictures. The wiring harness looks like factory original, no splices or rigged wiring. I've not seen this addressed before so here goes: Did the 12v cubs use a 6v coil? I wondered if this is why the ballast resistor is in place? Thanks. Stan
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tst
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Re: '76 Longstripe with Ballast resistor

Postby tst » Wed May 13, 2015 8:09 pm

probably the coil does not have an internal resistor is a guess

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Re: '76 Longstripe with Ballast resistor

Postby Jim Becker » Wed May 13, 2015 11:17 pm

That should be a 25 ohm resistor in the exciter circuit of the alternator. It prevents back feed from the alternator to the ignition.

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bob in CT
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Re: '76 Longstripe with Ballast resistor

Postby bob in CT » Wed May 13, 2015 11:25 pm

It is in the parts book. Without it, the tractor will not shut off. All the alternator conversions need a diode to do the same thing.

staninlowerAL
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Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
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Re: '76 Longstripe with Ballast resistor

Postby staninlowerAL » Thu May 14, 2015 4:15 am

Jim Becker wrote:That should be a 25 ohm resistor in the exciter circuit of the alternator. It prevents back feed from the alternator to the ignition.

OK, thanks Jim. I guess I just made the guess that since it looked like a ballast resister that's what it was. I've got lots more things to look at before attempting to start it.
bob in CT wrote:It is in the parts book. Without it, the tractor will not shut off. All the alternator conversions need a diode to do the same thing.

Thanks for the infor Bob. I'm familiar with the need for diode in a circuit for alternator conversions. Don't know if it makes any difference or not but this is a factory 12v system, not a field conversion. THE THINGS YOU LEARN ON THIS FORUM!!! :) :) Stan

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Re: '76 Longstripe with Ballast resistor

Postby Eugene » Thu May 14, 2015 7:14 am

Early Delco alternators had a voltage regulator attached to the back of the alternator.
I have an excuse. CRS.

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bob in CT
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Re: '76 Longstripe with Ballast resistor

Postby bob in CT » Thu May 14, 2015 8:52 am

Eugene wrote:Early Delco alternators had a voltage regulator attached to the back of the alternator.

Long Stripe alternators were internally regulated.

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Re: '76 Longstripe with Ballast resistor

Postby Boss Hog » Thu May 14, 2015 5:12 pm

Eugene wrote:Early Delco alternators had a voltage regulator attached to the back of the alternator.


I have never seen one that way unless you are talking about a built in regulator
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