Horn Relay: Testing and Inspection

Horn Relay Terminal Location




Check Relay continuity

1. Measure the resistance between relay terminal 85 and all other terminals. If any resistance is 5 ohms or less, replace the relay. Otherwise, continue with the test.




Apply Power to the Relay

2. Use jumper wires to apply battery voltage to terminals 30 and 85. Measure voltage at terminal 87A. If the voltage is less than 10 volts, replace the relay. Otherwise, continue with the test.




Check Relay Operation

3. Use a jumper wire to apply ground to terminal 86. Measure the voltage at terminal 87. If the voltage is less than 10 volts, replace the relay. Otherwise, return to the pinpoint tests.