Ranger 4WD L4-2.3L VIN D (2002)
Micro ISO Relay: Testing and Inspection
Continuity Checking With Meter
Use 73 Digital Multimeter to check for the continuity between terminal 2 and all other terminals. If resistance is 5 ohms or less between terminal 2 and
any other terminal, replace the relay. If resistance is greater than 5 ohms, continue with the test. Use two jumper wires to connect relay terminals 1 and 3
directly to the positive battery terminal. Use 73 Digital Multimeter set in the volts position to check for voltage at terminal 4. If battery voltage is not
indicated, replace the relay. If battery voltage is indicated, connect a third jumper wire to terminal 2 and ground the jumper wire to a known good
ground. Check for voltage at terminal 5. If battery voltage is not indicated, replace the relay.
