Posted by old fashioned farmer on March 14, 2013 at 14:37:02 from (99.160.220.88):
Howdy,
Got a farmall A in the shop with an electrical issue. The tractor is 6 volt, positive ground. Not sure what is wrong with it though. The generator and voltage regulator were taken to a shop and checked out okay. When the tractor is not running and the switch is on the third position the lights come on and it shows discharge. In the other two positions there is no change with the ammeter or lights. When running, there is no movement in the ammeter on the first and second positions of the switch but it swings to the discharge at around 15amps when in the third position with the lights on.
I checked the battery and it shows 6.4 volts when the tractor is both running and not running. I have polarized the generator. I am wondering about the switch as to whether it is correct for this tractor. It is a replacement switch and here is what it has on it. At the top there looks to be a resistor with no connections. Below it is a terminal marked F. Below that is a silver box with two connections on it and it is marked Bat. To the side is a connection marked L.
The tractor is wired as follows:
F terminal on generator to F terminal on voltage regulator. A terminal on generator to GEN terminal on voltage regulator. BAT terminal on voltage regulator to BAT terminal on switch. Second post on BAT switch terminal to ammeter. L post on voltage regulator to F terminal on switch. Second post on ammeter to starter.
I also checked my connections with the ammeter with the tractor off. I get 6.4 volts at all posts (except L on the switch and the F on voltage regulator).
I am wondering if the voltage regulator and switch may be incorrect for this tractor. Any assistance in solving this mystery would be greatly appreciated. Thanks in advance and God bless.
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