Re: 861 electrical question

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Posted by Tim Daley(MI) on March 22, 2019 at 04:23:10 [URL] [DELETE] :

In Reply to: 861 electrical question posted by Ozlander on March 21, 2019 at 12:05:25:

One common misconception on Ford Tractors is polarization. It is the generator that gets polarized, not the VR. It is just easier to perform the task via the VR. It is also important to know which Circuit the generator is wired as. There is the "A" Circuit and the "B" Circuit. Polarizing each is different and if done incorrectly, you will smoke the generator. You would need to verify which via an internal inspection. I'm not 100% certain, so best to verify first but I believe the Hundred Series models would have a "B" Circuit design generator. The OEM early 9N-10000-A small generator used a VR, and was the "B" circuit design. The 9N-10000-B generator became an "A" circuit design with the cutout and A's were used up thru all N production, with the 8N reverting back to a VR. The NAA tractor generator went back to a "B" circuit design. If you have ay doubts, take the battery, VR, and generator to your trusty local starter/alternator shop guy who knows Ford Tractor electrical systems. He can test all components. A good battery is an essential component and he can bench test it faster and easier with his machine. The battery must sustain a full charge under load to be effective. Simply attaching a battery charger or a 'trickle' charger does not mean your battery is good. Specific gravity must be met and is checked with a hydrometer. When the tractor is idle, best to have the battery on a float charger like the DELTRAN Battery Tender Jr. (6V). This sketch JMOR modified may help:


Tim Daley(MI)

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