Ebay would be one good place to get a factory service manual.
There is also Chilton and haynes, but both of those books are a crap shoot for getting the info you need.
ANOTHER problem with factory service manuals is they may have “supplements” for electrical or whatever.
So if you can thumb thru a chilton or haynes in the store, it is better. I know they often plastic-wrap the things which is stupid.
In all cases, find out the return policy. Ebay’s return policy is confusing, buyer may have to pay return shipping. So you could ask the seller if the book for sale includes info and diagrams of the fuses, relays, etc…
Only drag there is having to wait for the book to arrive unless they offer expedited shipping (NOT cheap)