John Deere MT

Nick Renchen · Aug 13, 2011

I have an MT and I was wondering what was the difference in new voltage regulators an the original one that it come from the factory. Would it make a difference seeing how the MT and M have two settings for charging, or is that function taken care of in the switch. Anyone with a wiring diagram that you could share would help me out also. Thanks.

Hotflashjr · Aug 14, 2011

If you are keeping the tractor with original electrical system with 6 volts it shouldn't matter if you purchase a new replacement voltage regulator. I believe the switch is just a switch in these. I have included a picture of the wiring harness diagram from the service manual. If you order a wiring kit it will come with instructions on how to install.

James Howell · Aug 14, 2011

The OEM cut out relay is no longer available from JD.

There are several reproduction cut out relays available from various retailers.

The different settings for charging are a function of the switch.

The switch is still available from JD.

This link will provide a <a href="http://img.photobucket.com/albums/v437/M-MAN/SM-2029/M-1-JPEG.jpg">wiring diagram</a> for the M.

Rewired all of our MT's and the M.

Used the original cut out relay on "Rusty" our 51MT.

<a href="http://s200.photobucket.com/albums/aa5/jameslloydhowell/John%20Deere%20Equipment/Rusty/?action=view¤t=021.jpg" target="_blank">

021.jpg" width="520" height="420" border="0" alt="Photobucket

</a>

Used a reproduction cut out relay on both "Mac" and "Sam" our other 51MTs.

<a href="http://s200.photobucket.com/albums/aa5/jameslloydhowell/John%20Deere%20Equipment/SAM/?action=view¤t=IMG_1552.jpg" target="_blank">

IMG_1552.jpg" width="520" height="420" border="0" alt="Photobucket

</a>

Hope this helps.

Nick Renchen · Aug 14, 2011

Thank you to all that have replied. I believe I have an original cut out switch also. How do i know if its good or bad? Which would be better for charging the battery a new voltage regulator or the original cut out switch. Thanks

Hotflashjr · Aug 15, 2011

Your tractor came with a cut-out if it is original 6 volt system. If everything is staying original I would say use the cut-out relay. It's worked for 60 years, no reason to reinvent the wheel I think. Both can be replaced and are available online through many of the parts dealers. Best way to test what isn't working is to start up the tractor, get out your multimeter, and see if your generator is charging. John T. has posted a generator testing procedure on here. Do a search for that and use that as your guide where to start and what steps to take next. Your generator may just need new brushes.

John Deere MT

Nick Renchen

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Hotflashjr

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James Howell

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Nick Renchen

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Hotflashjr

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