Its possible to convert from a 3 to a 4 terminal VR or vice versa. Either will work with only a minor wiring change.
HOWEVER: If the tractor previously used a 4 terminal VR where the extra 4th (L)oad terminal was used to feed hot battery to loads such as Lights and Ignition, you now need to feed those from the Load (NOT battery/starter) side of the Ammeter. If the tractor has the wire already down there that used to wire to an L terminal, you can simply connect it along with the BAT terminal (it also wires to Load side of ammeter anyway) but I prefer to re wire it direct to the ammeter in such cases.
Dont forget to Polarize the Genny prior to start up.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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