It's been many years since I fooled with a mechanical VR. But one thing is for sure. Current into your battery from the regulator only goes one way....into it normally.
Starting with the + battery terminal, following the wiring. First is the large wire that goes to the starting solenoid. That is your high current wire and you don't want to mess with that.
What you are looking for is the smaller wire (12 AWG) from the VR that connects to either the battery + or to the input terminal on the solenoid.....solenoid terminal used as a junction post .
I don't know how much charging current a mower generates, but it's not much as the battery isn't all that big nor is the load.
For an outside number say 10 amps. Probably more like 5 but use 10. Go to Radio Shack and buy a stud diode rectifier of 15-20 amperes. Tell the salesperson how you want to install it and get some adapter terminals. If you want to just cut the wire and insert it, tell him. If the VR wire goes to the solenoid tell him that one end of the diode will be attached to a (3/8" I think is the dia) stud and the other will be to a bare wire, or the terminal you took off the solenoid.
Position the diode so that it does not touch anything metal. If attached to the solenoid that will take care of that.
The diode has a symbol on it consisting of an arrow attached to a horizontal line. This shows which way you turn it to hook it up. Install it so that the arrow is pointing towards the battery.
That will drop your charging voltage to the battery a little but it won't be all that much and you probably will never know it.
Then whatever your charging circuit decides to do in the off period won't matter.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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