Horn Relay: Testing and Inspection

The current draw for a horn while operating should be 4.5 - 5.5 amperes at 11.5 - 12.5 volts. Review the following common conditions:
^ A high current of more than 20 amperes indicates an overheated winding or indicates a shorted horn. Replace the horn.
^ A current reading of about 18 amperes means the contact points are not opening. Adjust the horn.
^ No current reading indicates one of the following:
^ A broken connection.
^ An open circuit due to a broken lead.
^ An open circuit due to an overheated horn.
^ The contact points are open. Adjust the horn.

Perform the necessary step to adjust the current:
^ Turn the adjustment screw clockwise 1/4 turn (90°) at a time to increase the current.
^ Turn the adjustment screw counterclockwise 1/4 turn (90°) to decrease the current.