You can get a FSM from these guys. For an extra $15.00 iirc, you can get a VIN specific wiring schematic. The FSM is like over $100, worth every penny.
Toyota Material Distribution Center
750 West Victoria St
Rancho Dominguez/Compton, CA 90220-5538 USA
1-800-622-2033
(outside CA)(M-F: 7-5 PST)
1-800-443-7656 (inside CA)
1-310-818-4630 (in or outside CA)
The p/n for my 1985 Truck & 4Runner
There are some PDF files for free online, but some are missing, and many have been taken down over the years.