Nowhere that I know of.
you can find them in the numrich catalog or there web site e-GunParts.com
Numrich Gun Parts Corp.should be able to help you.
http://www.e-gunparts.com/
You can find schematics for a John Deere X324 lawn tractor in the operator's manual that came with the machine. If you don't have the manual, you can usually find it on the John Deere website by searching for the model number. You may also find schematics in a service manual or by contacting a John Deere dealer for assistance.
At the junkyard.
Try e-gunparts.com
looks like you might find it here: http://www.a-1appliance.com/lookup/107531/665700
Try an appliance parts website. Usually they have schematics and a breakdown of parts for appliances.
Try Numrich Gunparts. They have a wide variety of parts and schematics for older firearms.
which wiring schematics do you need?
You can possibly order or get the repair manual for the truck at a Toyota dealer's. You can also get wiring schematics from repair manuals sold in bookstores, such as the Chilton's series. Several companies offer manuals with wiring schematics online, you will find this by searching the keywords "repair manual" with the name and model of the truck.