charging system/polerizing

My 9n tractor 6 volt has no regulator and had positive ground when i bought it. It starts up, but amp meter shows discharge, should I
polerize it. it only has what looks like a new style resister. what is next step?
 
(quoted from post at 17:46:49 06/02/18) My 9n tractor 6 volt has no regulator and had positive ground when i bought it. It starts up, but amp meter shows discharge, should I
polerize it. it only has what looks like a new style resister. what is next step?
irst measure battery voltage before starting and again after running at speed for a few minutes. It could be charging just fine & just ammeter wired backwards.
 
Your tractor left the factory set up as (+) ground.

Verify that that's how the battery is connected, if reversed, the Ammeter will read discharge if the charging system is working. (Unless a P.O. reversed the wire/connections.)

Then, accurately measure the charging Voltage at the battery, should be around 7.4 Volts.

If NOT, NO WORRIES that you don't have a voltage regulator, as it's the GENERATOR that needs to be polarized.

BEFORE STARTUP, jumper the two terminals on the CUTOUT to polarize the GENERATOR.
 
Unless you have an early 1939 Ford-Ferguson 9N which used the early, first small generator AND a rectangular voltage regulator your system doesn't use one. That first 9N used generator #9N-10000-A, a 2-wire/2-brush unit, with the B Circuit design, used a voltage regulator, p/n 9N10505-A. By 1940, the 9N-10000-B small generator was released, a 1-wire/3-brush unit, with the A circuit design and now it used a roundcan cutout. Do you have that? What exactly is 'new style resistor'? You should have the OEM ballast resistor mounted on the rear dash panel. Get out your manuals and review. Just because you have a 6-volt battery does not mean you have everything all wired correctly. If ammeter is showing a discharge, it could be that it is simply wired backwards. Is the ammeter the original induction 'loop' style or is it the newer two screw terminal posts style? If terminal type, reverse the wires, if loop style, reverse the way the wire feeds thru the loop. Go thru all the wiring first before doing anything using manuals and 'WIRING PICTOGRAMS by JMOR'. Verify you have a cutout, p/n 9N-10505-B, a ballast resistor, and which style ammeter. Generator should be the 1-wire style as described above, I doubt if you have an early 9N with the A genny and VR. Starter should be with a one wire connection and NO SOLENOID.


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Tim *PloughNman* Daley(MI)
 

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