Section 13-06: Horn
1993 Mustang Workshop Manual
DIAGNOSIS AND TESTING

Circuit Check

Verify that ground at the horn is good by checking the connection for corrosion. Ensure the retaining screw is tight and horns are not touching surrounding sheet metal or other components.

Attach a wire from the positive (+) terminal of the battery to the horn. If the horn sounds normally, check the wiring between the horn and the horn switch. If the horn does not sound, replace horn.