Small Engines (Lawn Mowers, etc.): Electrical diagram for scott/noma tractor, briggs and stratton, key switches

Question
I am looking for a wiring diagram for a Scott Brand tractor manufactured by Noma. Model # E4315050, Code 4130, Ser # S003489331464. The tractor is powered by an 16 hp B&S and the wiring is intact for the most part. I want to use an automotive type keyed ignition switch with batt/acc/ign/start poles. Thanks in advance for your help.

Answer
Norma was purchased by Murry.  Murry is out of business or purchased by Briggs and Stratton, I think but there is allot of aftermarket parts for your mower.  As fad as an electrical schematic try talking to a B&S Master service dealer.  They nay have information for you.  Replacing the key switch with an exact match is important for proper operation.  I suggest going to Stens and search their key switches.  Hope I helped.