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Discussion Forum

WD 12 volt conversion

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06-04-2002 07:54:07

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I just picked up a 1950 WD which has some electrical problems. The previous owner disconected the generator and put in a 12 volt battery and coil, not having a charging system.
I was thinking of putting a 12 volt conversion kit, like I've seen for other tractors, but can't find one for a Allis WD, any body have ideas or sources for me. Thanks

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Steve in N.J.

06-04-2002 21:24:24

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 Re: WD 12 volt conversion in reply to Guy, 06-04-2002 07:54:07  
I have a 12V harness available for WD. Also designed a frame mount alternator bracket kit for Delco 10 SI alternators on WD. If interested drop me a line. Be glad to help ya out... Steve

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Gordon in IN

06-04-2002 21:23:37

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 Re: WD 12 volt conversion in reply to Guy, 06-04-2002 07:54:07  
Have been running a WC with 12 volt battery and lights and the original (6 volt) generator and original (6 volt) starter since the early 1970's. No change to wiring harness is required. Just add a resistor in the line TO the "field" of the generator to get 13.8 to 14.2 volts at the battery when running at full engine RPM. The dual charging rate/light swith even works as intended. If you do not add a resistor, the charging voltage will be much too high and you will "cook" the battery or "fry" the generator or both. I like to use a "standard" or low to medium amp rated battery to prevent the starter from being too agressive. A really high amp 12 volt battery did not hurt the starter when I first converted the tractor to 12 volt, but it did destroy the starter drive bendix spring (My WC has high compression over bore piston/sleeve set in it - standard bore with standard compression should be more "forgiving".) My WD has a 12 volt GM (Delco) alternator with an internal regulator wired the same way it was in the cheverolet it came from. Try to get the lowest amprage alternator you can. You do not need very much charging amprage on a WD tractor. High amprage alternators can cause belt slipping or wear out the belt quickly. I like to use a "extra service" or "severe service" fan (V) belt (like the V belts used on riding lawn mowers.) The fan belt is no "fun" to replace on these tractors. Have fun, Gordon in IN

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Dave Grubb

06-04-2002 11:00:53

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 Re: WD 12 volt conversion in reply to Guy, 06-04-2002 07:54:07  
Do a forum archives search on this site and type in 'genesse' on the AC forum. This will give you a bunch of articles on the conversion. Genesse Products can supply you with everything you need to convert to a 12 volt electrical system or whatever pice of the system you need. I have purchased several items from them and they are good. I installed their electronic ignition kit and have been very pleased. If you search around on the site there are some wiring diagrams available also. If you search articles by author type in the word 'duey'. You will find a lot of his replies. He is probably the last word on electrical stuff.

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Bryan Smith

06-04-2002 11:20:39

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 Re: Re: WD 12 volt conversion in reply to Dave Grubb, 06-04-2002 11:00:53  
Dave's right - Genesee Products are great folks to work with. They sell a wiring harness specifically for the GM 10Si alternator you might put on your tractor. Genesee even has a 5/8" pulley for the GM alternator so you can run the normal width belt on the tractor.

AGCO sells a replacement wiring harness like the original. If you get the existing generator re-wired to 12 volt (with the little square regulator sitting on top) for a more original appearance you could use that harness with a little modification - that's what I did on my WD45. Cheaper to buy the alternatopr than to re-wire the generator, but you have to do what suits you.

There are several others that sell harnesses. Duey's website has witing diagrams for all this (link below). For your info, the Genesee wiring harness has a diode built in so you don't have to have the key switch with accessory pole to prevent feedback ....

(Note that Genesee doesn't make electronic ignition for the magneto systems - only for battery ignition systems with 12 v neg ground for AC tractors)

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