Re: Boosting Battery Charging ?
Tom: thank you for your thoughtful post. I think you touch on the key factor, (the phase of the two AC outputs), on whether this will work.
The frequency of the two stator outputs would be the sameóboth directly proportional to engine RPM. The phase of these two is unknown, so maybe install another, separate, diode on the 5 amp headlight output and combine these (connect them together) after the diode rectifiers. That is combining them as DC.
My particular Craftsman has a 20 hp. Briggs & Stratton engine (461707) but your provided link to the Kohler Regulator Rectifier with two AC inputs and one DC output may do the trick. My B&S has no regulator and only one rectifier diode on the 3 amp battery charging circuit.
Combining the two AC voltages, after rectification, I think eliminates the phase problem. I very much appreciate your alternative idea! It seems like a reasonably cheap solution which may work & help in keeping the battery charged. bob