The mechanics at the Ford dealer let me photocopy from their shop manual.
Also, most libraries have computers you can use and have subscriptions to research databases. EBSCOhost is one of these research databases that now has the Auto Repair Reference Center, which has some wiring diagrams for every vehicle. It's the kind of thing College of Technology students would access. There probably are others, so ask your librarian how to access the electronic resources and see what's available.
ebay
ford or eBay
There are various websites where you can find a wiring diagram for a Mitsubishi Triton 1993. You can also find the diagram in the vehicle's owner's manual.
A person can get a wiring diagram on forum websites. They can also find a diagram from the specified maintenance books.
You can find some of the wiring diagram at, commandocaralarms.com
Not here i guess
Yes, there is a wiring diagram fro the stock stereo for the 1993 Lincoln Continental. This can be find in the maintenance manual.
You can find a radio wiring diagram for a 1993 GMC Sonoma in the vehicle's owner's manual. You can also find it at local auto parts stores.
Most repair manuals have the wiring diagrams in them.
try haynes.com
online
Check your local library for service manuals