Exterior Lighting

Special Service Tool(s):

Special Tool(s)

Testing an ISO relay can be accomplished through the use of three No. 10 (or larger gauge) jumper wires and a 73 Digital Multimeter 105-R0051. 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 105-R0051 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 the 73 Digital Multimeter 105-R0051 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.