The wiring diagrams will be in the Technical manuals. JD shows two Technical (service) manuals for the 4630 based on the tractor serial number. TM1058 for tractors with serial numbers before 11717 or TM1172 for tractors serial number 11717 and after. The numbers may help you with your search or if you need to purchase the correct manual.

Some dealers will print copies of selected info; you might ask your dealer.
 
Its not a John Deere its a Ford New Holland .
Welcome to the forums, I should have said that before.

This shows how important it is to give all the information, as using just a model number can lead several ways, as seen here.

You might want to post about this down below in the New Holland (or Ford specific forums as the 4630 NH and 4630 Ford are supposedly the same tractor). Those forums are in the Manufacturers Section located down the page from this general section.
 
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