If it is in fact a 917.377410, then try the link below.
probably craftsman.com
You can find a wiring schematic for an 88 Craftsman GT ride on lawn mower at various tractor supply stores. You can also find it in the mower's owner's manual.
You can go to sears .com an put in the model number.Then you can download your manual
Try from Sears at Manage My Home at the link below:
You don't mention the brand of lawn mower. If it is a Sears or Craftsman, you have to get it at Sears. If it is another brand, try a Google search to see if there is a downloadable manual online.
You can find it at:http://www.sears.com/en_us/customer-service/product-information/find-a-manual.html
You can find it at:http://www.sears.com/en_us/customer-service/product-information/find-a-manual.html
You can purchase Craftsman lawn mower parts from the Sears website. Alternatively, you can also find Craftsman lawn mower parts from the Mow Part website.
Check out http://www.managemyhome.com; they have manuals for almost all appliances and other things you need around the house. I found the manual for my Craftsman mower here. Good luck.
Try Here: http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0806846.pdf
craftsman edger 536.797521 user manual
When fixing things it is important to have the repair manual. A repair manual for a Craftsman 358791580 can be found in Craftsman forums online and in the stores that sell Craftsman products.