Your starter has gone bad and will need to be replaced unless you can take the starter to an automotive electrician and he may be able to fix it.
Check and or replace your starter solenoid.
On your 1992 Ford Ranger , 4.0 liter : The starter should be on the drivers side of the engine , low down , where the transmission bolts to the rear of the engine
The 2004 Ford Ranger starter is located on the right hand side of the engine. The starter will be at the back of the engine.
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attached to your transmission
If the bolts have been removed and the wires disconnected, try tapping the starter with a wooden block to loosen it, Sometimes the starter will stick in place due to sludge and grime.
The 1992 Ford Ranger 4.0 liter had a 197 * Fahrenheit thermostat from the factory
A 1992 Ford Ranger is fuel injected so it would have an ELECTRIC fuel pump
The 1992 Ford Ranger ICM is located on the firewall in the engine compartment. The ICM will be on the drivers side of the firewall.