Current Draw Diagnosis

Current draw for a horn while operating should be 4.5 to 5.5 amperes at 11.5 to 12.5 volts. High current (more than 20 amperes) indicates an over-heated winding or shorted horn; replace the horn. A current reading of about 18 amperes means the contact points are not opening; replace the horn.

No current reading indicates a broken connection, or an open circuit due to a broken lead or overheated horn. An overheated horn must be replaced No current reading may also mean the contact points are open; replace the horn.