F 150 2WD Pickup V8-4.6L SOHC VIN W (1998)
Exterior Lighting Relay: Testing and Inspection
Relay Component Test
Testing an ISO relay can be accomplished through the use of three No.10 (or larger gauge) jumper wires and 73 Digital Multimeter. Remove the relay to
be tested from the power distribution box, fuse junction panel or individual connector.
Terminals
Micro ISO Relay
Use 73 Digital Multimeter to check for 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 the test. Use two jumper wires to connect relay terminals 1 and 3 directly
to the positive battery terminal. Set 73 Digital Multimeter in volts position and check for voltage at terminal 4. If battery voltage is not indicated, replace
the relay. If battery voltage is indicated, connect the third jumper wire to terminal 2 and ground the jumper wire to chassis ground. Check for voltage at
terminal 5. If battery voltage is not indicated, replace the relay.
