Expedition 2WD V8-281 4.6L VIN W EFI (1997)
Blower Motor Relay: Testing and Inspection
Digital Multimeter
Special Tools
RELAY COMPONENT TEST
Testing of an ISO relay can be accomplished through the use of three No. 10 (or larger gauge) jumper wires and a 73 Digital Multimeter. Remove
(unplug) the relay to be tested from the engine compartment fuse junction panel, I/P fuse junction panel or individual connector.
Mini ISO Relay
Use 73 Digital Multimeter to check for the continuity between terminal 85 and all other terminals. If resistance is 5 ohms or less between terminal
85 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 86 and 30 directly to the positive battery terminal. With the multimeter set in the volts position, check for voltage at terminal 87A. If
battery voltage is not indicated, replace the relay. If battery voltage is indicated, connect a third jumper wire to terminal 85 and ground the jumper
wire to a known good ground. Check for voltage at terminal 87. If battery voltage is not indicated, replace the relay.
