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It is not advisable to install a car horn without a relay. The current draw of a horn is too much to run directly through the car and horn switch. Relays are used on items that have a high current draw for this reason. It is an unsafe practice to not use a relay in these conditions. You would not want to catch your car on fire.

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โˆ™ 2011-03-22 15:45:23
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Q: How do you wire a car horn without a relay?
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The wire to the relay grounded somewhere. Take it to a garage to get it checked out.

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