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Horn Relay Circuit Test

NOTE: Electrical connectors must remain connected during horn relay testing.
  1. Locate horn relay. See HORN RELAY LOCATION table. Check for battery voltage at Yellow/Light Blue wire at horn relay. If battery voltage is not present, check fuse and/or wiring back to fuse panel.
    HORN RELAY LOCATION

    Vehicle Location
    Aerostar Right Side Of Steering Column,
    " On Relay Bracket
    Bronco, Pickup & 1991 Van Engine Compartment
    " Fuse Panel
    Explorer & Ranger Behind Lower Dash Panel,
    " To Right Of Steering Column
  2. If battery voltage is present in step 1), check for battery voltage at Dark Blue wire on socket side of connector. If battery voltage is present, press horn button. Voltage should drop to zero volts and horn should sound. If horn does not sound and voltage remains at 12 volts, ground Dark Blue wire.
  3. If horn still does not sound, check for battery voltage on Dark Blue wire when horn button is pressed. If battery voltage is present, repair open between horn and horn relay. If voltage is not present, replace relay.
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