For 1990-2009 cars

• | Measure the current draw of the horn while the horn is operating. The current draw for the horn should be between 4.5 amps and 5.5 amps (11.5 volts and 12.5 volts).

• | No current reading may indicate one of the following conditions:

- | A broken connection

- | An open circuit -- due to a broken terminal or overheating

• | A continuously operating horn causes most horn conditions.

| Overheating is accompanied by a characteristic odor. This odor indicates that the horn has overheated. Replace the horn if the odor is present.

• | An absence of current may indicate that both of the following items is true:

- | The contact points are open.

- | A current adjustment is necessary. Refer to Horn Current Adjustment .

• | A high current of over 20 amps indicates a shorted horn.

| Replace the horn if a high current exists.

• | A reading of approximately 18 amps for a 12 volt horn indicates that the contact points are not opening.

| If a current adjustment is necessary, refer to Horn Current Adjustment .