Can you be specific on your question. "How to connect the spade terminals?" Connect them to the wires or connect them to a component or connector? We don't know what all you have in the kit. Open it up and spread it out and take some pix for us and show us what you are calling a spade terminal. I know what it is but we always need to be on the same page before starting the help process.
If you are asking how to wire the truck in general, that is no problem.
1. Let us know what motor.
2. Any aftermarket electrical add on or modifications?
3. 6V or 12V?
4. Stomp starter?
5. Do you have any wiring experience?
6. do you just want a wiring diagram for a 40 truck or do you want us to get you wired up.
7. Does the kit have a prewired fuse panel or no fuse panel?
Thislooks like what you have. Scroll down the page for instruction download. 
