There is a website called The Ranger Station that might have the fuse box diagram. Don't know the URL, but you can probably find it through Google.
diagram of fusebox on 1988 ford ranger
autozone.com has free online manuals
wiring diagram for 98 ford ranger door alarm
A diagram of what component?
A 1990 Ford Ranger is OBD I / EEC IV - if that's what you are asking
location of fusable links Ford Ranger 1990 2.9
A Ford Ranger pickup truck wiring diagram can be obtained from most Ford dealerships. The wiring diagram can also be found at most auto-parts stores.
spark plug gap on 1990 ford ranger 4.0?
is there a picture of where the horn fuse is located on a 1990 ford ranger
You can obtain a 1997 Ford Ranger exhaust system diagram from most Ford dealerships. The diagram can also be found at most auto-parts stores.
No. From 1983-84 Ford used the C3 transmission. A 1990 will not fit.
Wikipedia has a great history of the ford ranger line.