Posted by John T on February 14, 2022 at 15:44:20 from (174.211.174.110):
In Reply to: 12 V generator posted by Sam Womer (PA) on February 14, 2022 at 11:10:04:
One (among others such as voltage and polarity) reason the old VR may not be useable is if it was for a Class A Charging System (like the Ford may well have been unless it got changed) but the new Genny may be a Class B ???? I DONT KNOW SITTING HERE THINGS GET MODIFIED OVER THE YEARS. BOTH the genny and VR need to be matched for Class A or B as well as voltage, current and polarity. You have to get the correct Genny and matching VR for the battery (Class A or B, Voltage, Polarity) before anything
Before any start up I would POLARIZE the genny to match the battery polarity, be its POS or NEG Ground
Sure you can use a motor to spin the genny to check it before installation, or else instead of using a motor let the tractor spin it AFTER insuring the genny and VR are properly matched (Class A or B,,,,,,,Polarity,,,,,,,,Voltage),,,,,,,,,,, Polarize the Genny,,,,,,Wire up the Genny, VR and ammeter correctly, start the tractor and see if battery is charging or not IE see if its voltage rises as RPM increases and it produces Pos charging current INTO the battery versus Neg discharging current OUT OF the battery.
You ask do I connect an ammeter to the battery terminal on the regulator directly to a battery polarize it and test that way?
You would wire the VR's BAT terminal to the LOAD side of an ammeter, ammeters other SUPPLY side to the Battery, VR's FLD terminal to Gennys FLD post,,VR's GEN/ARM terminal to Gennys ARM post,,Battery ground to VR case ground and Gennys case/frame ground
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