1 - Yes! A properly wired ammeter deflecting to the right of 0 indicates the battery is being charged. The greater the deflection the higher the charge rate.
2 - It depends. If you are starting/running the tractor for only short periods (5 - 10 minutes), or running mostly at low RPMs, set the switch to "high" to keep the battery up.
However if you're running at governed RPM for extended periods set the switch to "low". Otherwise you'll overcharge the battery and shorten its life. (A nearly new battery exploded on my Minnie-Mo last winter when the operator (not me!) inadvertantly knocked the charge switch to "high" then ran the tractor at speed for a couple hours.)
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Tip: Unless you are a stickler for originality, a better approach is to replace the cutout with a voltage regulator and dispense with the manual charge control.
A VR does a MUCH better job maintaining a proper charge rate. This keeps the battery more fully charged and eliminates the risk of overcharging.
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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.
... [Read Article]
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