One wire alternator question
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=183184
Printed Date: 18 Jul 2025 at 3:25pm
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Topic: One wire alternator question
Posted By: Goose
Subject: One wire alternator question
Date Posted: 11 Sep 2021 at 7:35pm
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I've had a mini one-wire alternator for a while and now I am thinking of installing it on my C. I looked on the back of the alternator and it has provisions for a connector and has two blades. Can anyone tell me the purpose of the connection? Does this offer the ability to connect it as a three-wire alternator? If so, which blade connects to what? Any help would be appreciated.  ------------- "People are human beings, produced by the society in which they live. You encourage people by seeing the good in them." ~ Nelson Mandela |
Replies:
Posted By: steve(ill)
Date Posted: 11 Sep 2021 at 7:46pm
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yes. that is what the plug is for.... should be some numbers or letter on the case, but looks like this.... the "light" can be a diode, resistor, or idiot light. in the picture, the "fuse box" is basically the ON- OFF key /switch  ------------- Like them all, but love the "B"s. |
Posted By: John426
Date Posted: 13 Sep 2021 at 2:45am
With an alternator which has only 2 terminals, D + and B +, does the light connected in D + can be a simple light like a led, or must be a bulb light with minimum power light 3W to excite the alternator? |
Posted By: steve(ill)
Date Posted: 13 Sep 2021 at 8:44am
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john, normally a LED is not used.. What is needed is a small drop in voltage to the terminal to TELL the alternator to kick in and start charging... You can use a small filament bulb, sometimes a DIODE, or a resistor. ....I found an old DELCO "test book" years ago that said on a TEST BENCH, they used a 10 OHM resistor for testing the older 10SI alternators, and a 100 OHM resistor for testing the newer C130 units......... i think that works out at 14 watts for the old unit and 1.4 watts for the newer unit..... I got resistors at RAdio Shack... about 1/4 inch square and 2 inches long for $2 each. ------------- Like them all, but love the "B"s. |
Posted By: jaybmiller
Date Posted: 13 Sep 2021 at 8:54am
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goose.... it's a 'one wire' alternator, one wire from stud to battery,so do NOT assume those 2 pins DO anything !!! The casting is common to several styles,both 1 and 3 wire alternators and windmill power units. That could just be a 'hole filler'( other side of pins go nowhere...). Connector is cheaper than a solid plug. you best contact whoever MADE the alternator, not the reseller.....for real information. ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: Charlie175
Date Posted: 13 Sep 2021 at 9:49am
Indeed! I just have the 1 wire on mine to the battery. Nothing else is needed. Starts charging as soon as it starts up ------------- Charlie '48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD |
jaybmiller wrote:Posted By: Luke114
Date Posted: 13 Sep 2021 at 12:15pm
| Jay, I've wondered if that was the case for my one wire alternator. It works just fine with only the main wire connected (as the name implies). I tried to hook up the idiot light only becuase the terminal was avilable, and it won't work. Guessed that the connectors are just plugging the hole. |