Econoline E550 V10-6.8L VIN S (2003)
Micro ISO Relay: Testing and Inspection
RELAY COMPONENT TEST - MICRO ISO RELAY
Using 73 Digital Multimeter, check for the continuity between Terminal 2 and all other terminals. If the resistance is 5 ohms or less between Terminal 2
and any other terminal, install a new relay. If the resistance is greater than 5 ohms, continue with the test. Using two jumper wires, connect relay
Terminals 1 and 3 directly to the positive battery terminal. Using 73 Digital Multimeter set in the volts position, check for voltage at Terminal 4. If
battery voltage is not indicated, install a new 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, install a new relay.
