Converting a Farmall 140 from generator to alternator

nathanialbumpo · May 15, 2018

I want to convert 140 to alternator, any kits or instructions available?

leroy in ne · May 15, 2018

on modern view use search function on 12 volt conversion, this is discussed frequently and should gett you some answers. there are parts available on this sight such as universal brackets ect., delco alternators ect.

old · May 15, 2018

This site is likely to have a kit for that but me I make my own. I use the alternator fro ma 1980 Chevy pickup no power any thing no AC. Then I wire it up which is also simple and Bob has posted pictures of it so they are in the archives.

Charlie M · May 15, 2018

I just converted my A. It has a mag so I bought a one wire alternator and bracket from this site. Had to put a longer belt than the A generator had on the alternator but a belt listed for a Super A with a
water pump was just right. You should get a 3 wire assuming you have a distributor and it will need a diode installed in one of the wires. If you keep the 6v coil then you will need a resistor going to the hot
side of the coil to reduce the 12 v down to 6 v. The kit may come with instructions or if not there is a ton of information if you google it. Your starter will be OK as is.

D beatty · May 15, 2018

I convert my Farmall B to 6 volt alternator and changed nothing.

mattofvinings · May 16, 2018

If you look up "Denso mini alternator" on ebay you will find a China thing good for about 30A that's one wire and fits perfectly under the hood of many tractors for around $55. Output appropriate for typical daytime use just needing to supply ignition and charge the battery.

I have 3 tractors running on them right now, the longest is on its 2nd season now. I just make brackets in the shop.

The other advice is to redo the entire wiring harness at that point, there are bound to be worn insulation, cracked this and that. I figure I want the tractor go be good for another 20 years of light service without messing with it constantly.

I went with weatherpacked fuse holders and a weatherpacked relay for the ignition all from ebay a well.

nathanialbumpo · May 16, 2018

Thanks for the info, it is already a 12 volt system, but the generator doesn't seem to keep up because of the low speeds we run at. It is used in a semi commercial gardening operation. I converted a 1943 9N 2 years ago, just wasn't sure if it was the same deal.

Converting a Farmall 140 from generator to alternator

nathanialbumpo

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leroy in ne

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old

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Charlie M

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D beatty

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mattofvinings

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nathanialbumpo

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