Re: Another A farmall charging problem

Posted by Bob M on July 02, 2003 at 05:33:16 from (165.170.128.65):

In Reply to: Another A farmall charging problem posted by Terry on July 01, 2003 at 21:32:10:

Terry - Sounds like a problem in the generator field control circuit - probably a poorly grounded ammeter box or bad light switch. Try this: Run a temporary jumper wire from the grounded battery terminal to some clean metal on the ammeter box cover, then run the motor. If the ammeter now shows 10 amps or so, you need to clean up between the box cover and the tractor frame to give it a good ground. (Or you can run a permanent ground wire to the box cover).

If the above doesn't work, try temporarily grounding the generator field terminal at the light switch. If the ammeter now shows a charge it says the problem is with the light switch (bad switch or field resistor).

If THAT doesn't work, problem's gotta be in the wiring (broken wire) between the light switch and the generator.

Also note: When using your voltmeter to test system operation, stick the probes directly on the battery terminals. If the generator is charging the voltmeter should show 7.0 volts or a bit higher at the battery. Also as you observed, some DVM's give erroneous readings on generator systems on account of electrical system "noise" caused by the generator. Your analog meter will give you the most accurate readings for this type of work - presuming it's in calibration of course…

Hope this helps!

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