To Search for Manuals and Parts for Older Mowers;
>>You can Use the Site Addys at this Site Addy; http://www.yetmans.mb.ca/antiques.html
to Search and Locate New/Used Parts or for Manuals for this Unit.
For Illustrated Parts List and Possible Parts;
You can View a Breakdown of this Unit at this Site Addy; http://www.partsandservice.com/
and Select the Illustrated Parts Catalogues Under the Online Parts Store Section. Now Using the "Select a Product Line, Product Category, Model and Page" Section. Look Up your Unit. Select the Wiring File and you will be Able to View the Electrical Schematic Online.
Please, Do Not Hesitate, If I Missed Something or you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.