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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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