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3 Wire Alternator: Terminal Identification

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PaulW_NJ

05-30-2005 17:26:59

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My 51 Cub had been converted to a 12v negative ground alternator system when I bought it. However, I don"t believe the alternator was ever connected properly. It is a Toshiba alternator.

There are 3 connections: a bolt (labelled "B") and two spade lugs (one labelled "L", and the other not labelled). I understand that the B post goes back to the battery. The spade lugs are where I am confused. I found archives that identify spade lugs on a Delco alternator as #1 and #2, and describe how to wire them up (#2 is a jumper back to the B post, and #1 connects back to the ignition switch). However, I"m not sure how to relate that to my alternator.

Is anyone familiar with this alternator and can you tell me which terminal my "L" lug is?

Thanks alot.

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farmallhal

05-30-2005 19:11:11

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Re: 3 Wire Alternator: Terminal Identification in reply to PaulW_NJ, 05-30-2005 17:26:59

Paul, when I converted my H to 12 volt negative ground with a Hitachi alternator I was faced with the same dilemma. Bob Melville provided the answer to me and I believe it applies to you as well. The "L" is for the circuit with the light, resistor or diode installed back to the ignition switch and is labeled "1" in his diagram and the other spade lug which was labeled "S" on the Hitachi is for Sense and was the same as the "2" terminal in his diagrams for the jumper back to the Bat. terminal. I used insulated female spades on my conversion to prevent any possibility of a short between the two spades on the alternator. I'm betting this will work for you as well. Bob may see your post and may answer with his technical knowledge also.

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PaulW_NJ

05-30-2005 19:41:37

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Re: 3 Wire Alternator: Terminal Identification in reply to farmallhal, 05-30-2005 19:11:11

Farmallhal

Thank you for your response and information. I was trying to remember the type of alternator I had, and incorrectly stated it is a Toshiba. It actually is a Hitachi like yours, so your information is just what I needed.

Could you also tell me what kind of diode you installed? I checked at my local NAPA dealer, but they suggested I try Radio Shack. I don"t want something that would be installed in an electronics circuit board, but robust enough for this service. Can you tell me what power specifications I should look for in finding a diode?

Thanks again

Paul

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farmallhal

05-31-2005 17:15:03

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Re: 3 Wire Alternator: Terminal Identification in reply to PaulW_NJ, 05-30-2005 19:41:37

Sorry this has taken so long but have been out all day in a tractor seat. Just came back in for dinner or supper whatever you call it.
I didn't use a diode or the light shown in Bob's diagrams but used a resistor instead. I read somewhere they worked fine and I obtained it at Radio Shack. It was a 10 ohn rated at 10 watts and came in a package of two for about $2.00. I put it in the circuit where the warning light is shown. It is a ceramic style resistor and very robust for field use on a tractor. I also used a Chrysler RU12 ballast resistor instead of the one noted in some of the articles as it passed more current to the coil. The RU12 was running 5.6 volts through the coil and the one I saw in some conversion articles was only passing 4.3 volts. Hope this helps with your tractor.

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Dave in CT

05-30-2005 21:49:41

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Re: 3 Wire Alternator: Terminal Identification in reply to PaulW_NJ, 05-30-2005 19:41:37

I felt the same way but wound up getting the below diode from Radio Shack for my H's setup. I just wrapped it with electrical tape and then sealed the whole shebang with heat-shrink tubing. It's got the strength I was looking for.

silicone diode
Radio Shack item number 1N4003
banded end toward the #1 alt terminal

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