Fuel Shut Off Valve - Check; Oil Pressure Switch And Temperature Sensor - Dodge D250 1990 Service Manual

Diagnosing Electrical Malfunctions
Page 8-10
Electrical System
DODGE Turbo Diesel
With ignition switch on and all wiring harness leads connected,
connect a voltmeter from:
1. Alternator "BAT" terminal to ground
2. Alternator field terminal to ground
3. Alternator field terminal to ground
A zero reading indicates an open circuit between the
voltmeter connection and the battery. Locate and repair
the open circuit.
With all accessories turned off, connect a voltmeter across the
battery. Operate engine at moderate speed.
If voltage is 12 Volts or less, repair the alternator or voltage
regulator as necessary.
Fuel Shut off Valve - Check
Note: Check all connections for loose or corroded connections
N^J and for broken wires.
Remove the valve. Ground the valve and connect 12 volts DC
to the terminal and observe plunger movement.
Oil Pressure Switch and Temperature Sensor
When diagnosing problems with either the pressure switch or
the temperature sensor, check for loose or corroded
connections and for broken wires.