Hi Don, welcome to Outdoorking.

Here is the Operator's Manual for your engine:
http://bsintek.basco.com/BriggsDocumentDisplay/msozHP-K_ny7tH217FzoPu.pdf

Here is the Illustrated Parts List for it:
http://bsintek.basco.com/BriggsDocumentDisplay/Z6nlxBVJ1DajI.pdf

You will notice that the wiring diagram you are looking for does not exist: there are 4 different alternators optionally fitted to your engine, and its charging circuit only consists of a pair of wires with a diode in series with one of them. I'm guessing that the wiring diagram you are looking for will be for the ride-on, not for the engine. If you give us details of the ride-on, we can see whether we have a manual for it.