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WHY DOES A CAR NEED A HORN RELAY?CAN'T A HOT WIRE FROM A HORN BUTTON MAKE THE HORN BLOW?JUST ALWAYS WONDERED.:confused0006:
 

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The amount of Voltage going through the Horn switch will blow out the switch after awhile..The relay eliminates that...or it keeps High Current away from peoples Hands!!!

Or my Brother In Law makes Relays so Use all that you can...LOL
 

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Trifive Automotive Electrical Wiring Expert
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WHY DOES A CAR NEED A HORN RELAY?CAN'T A HOT WIRE FROM A HORN BUTTON MAKE THE HORN BLOW?JUST ALWAYS WONDERED.:confused0006:
The horns do require too much current for the horn contact, but the horn switch is a ground for the relay and does not provide power to the relay. It provides a ground path to activate the relay.
An aftermarket switch such as a starter button could be wired to voltage to activate the horns, but a much larger wire would be needed from the button to the horns and it needs to be fused.
Also, on a 55, the horn relay acts as a tie point for voltage from the regulator to the rest of the car.
 

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You have relays which complete a circuit for a larger amp drawing item-horn, starter etc.
Then you have contactors which can operate even larger voltage items 460 etc, using only 24 volts to power the coil of the contactor.
 
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