Farmall H generator will not charge

Darwindo · Nov 28, 2012

I took the generator and voltage regulator from my 1941 H to Ankeny Auto Electric in Ankeny Iowa. They tested it out and say it all works perfect. It is installed on the tractor exactly like the diagram shows. I polarized it and still, the meter reads that it is discharging while the engine is running. If I hook a battery charger (Neg to the Bat terminal of the voltage regulator and Pos to ground) the meter will show that it is charging. Any ideas? I am getting frustrated.

gene bender · Nov 28, 2012

Change the leads on the ammeter you never know over the yrs what has been changed. With engine off and lites on does it show discharge.

Darwindo · Nov 28, 2012

Engine off, lights on, it shows a discharge.

Bob M · Nov 28, 2012

Your test shows the ammeter is wired correctly and is working!

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A couple possibilities for the "no charge" condition:

1 - A bad ground at the VR. Try running a wire from the regulator base to the grounded battery post. Check also also the ground jumper between the VR box and the sub-base is still intact.

2 - Loose/slipping generator belt. Check and tighten as required.

John T · Nov 28, 2012

If shes settin there not running and you turn lights on and the ammeter swings to - discharge, the ammeter must be wired at the correct polarity, and even if the genny shop had the genny at Neg ground once you installed it on the tractor at Pos ground but then polarized prior to start up, it ought to be okay.

In case the ammeter isnt working to see if its charging or not put a voltmeter on the batetry and when setting not running Id expect like 6.3 volts but if running at fast RPM if the genny is okay Id expect the battery voltage to rise to 6.5 to 7+ volts DOES IT?????? If so shes charging.

If not, when running momentarily dead ground the gennys FLD post n see if she charges then?????? If so BUT NOT OTHERWISE::::;

LHBD switch dont have a good ground,,,,,the resistor on the LHBD is bad/open,,,,,,,the wires open from FLD on genny up to LHBD......

Try this for a complete procedure

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=jd&th=458743

John T
John Ts Charging Troubleshooting

TractormanNC · Nov 28, 2012

You mention "voltage regulator" but show a diagram for a cutout relay. Which is it????? Your diagram is 100% correct for a cutout. If you have a true voltage regulator, it should have 4 terminals (BAT, GEN, F, L). Bob M's famous wiring diagrams will show you how to wire it right.

Farmall H generator will not charge

Darwindo

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gene bender

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Darwindo

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Bob M

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John T

Well-known Member

TractormanNC

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