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Rear Defogger Relay

WARNING: This page is about a different car, the 1997 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
  1. Unplug relay located in fuse relay panel under right side of instrument panel. Check continuity between relay terminals No. 30 and 87A. See Fig 1 . Continuity should exist. Check continuity between relay terminals No. 30 and 87. Continuity should not exist. Replace relay if not as specified.
  2. Using 2 jumper wires, apply battery power and ground to relay terminals No. 85 and 86. Using a third jumper wire, apply battery power to relay terminal No. 30. With power applied, measure voltage between ground and relay terminals No. 87 and 87A. Voltage should not exist at terminal No. 87A and battery voltage should exist at terminal No. 87. Replace relay if not as specified.
Fig 1: Testing Rear Defogger Relay
G96I29346Courtesy of FORD MOTOR CO.
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