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Wiper Relay

  1. Remove wiper relay. Measure resistance between terminal No. 1 and all other terminals on relay. See Fig 1 . All resistance readings should be more than 5 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace wiper relay.
  2. Using 2 fused jumper wires, apply battery voltage to terminals No. 2 and 3 of relay. Measure voltage at terminal No. 4 of relay. If battery voltage exists, go to next step. If battery voltage does not exist, replace wiper relay.
  3. Using another jumper wire, ground terminal No. 1 at relay. Measure voltage at terminal No. 5 at relay. If battery voltage exists, relay is okay at this time. If battery voltage does not exist, replace wiper relay.
Fig 1: Identifying Wiper Relay Terminals
G98G00329Courtesy of FORD MOTOR CO.
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