If it is a 6v (as I assume it is) the battery should be placed in it with positive ground. I also assume it discharged as soon as you hooked up the battery, and before starting it. There is a high current load on the system. There are three places it could go. One is to the charging system. A stuck cutout relay in the regulator, or a shorted wire would do it. The second is to the ignition. That would only happen if the switch were on? or the wire from the Amp meter to the switch is shorted to ground. The third is in the light system and that is not it unless the lights are on. I would start with disconnecting the VR/cutout and seeing if it still does it. The next thing would be to trace the wires from the Amp meter to make sure they are not rubbing the frame. Jim
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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