Its the voltage at/on the battery that really matters NOT the open unloaded output of the genny only. That being said, I DONT THINK I WOULD DO ANYTHING FOR A WHILE. Right after a start up its normal for her to charge at a fairly high output, but after a while she ought to back off, see if that happens after 30 or so minutes at fast RPM. Yes 15 sounds a bit high IF THE METER IS ACCURATE??? and if it stayed there a long time you may overcharge and boil over. Id expect after a while it (battery voltage) should back off to like 13 to 14 volts depending on battery and genny and RPM.
Keep an eye out for excessive outgassing and/or acid boil over and have the battery tested and if its okay run her a while BEFORE messing with the VR, it may be doing its job or you meter may be off??
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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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