Hello, do I need to hook up a relay to install an ahooga horn on my 1954 chevy belair? Thanks Posted using the Full Custom H.A.M.B. App!
Is it original, or aftermarket? I got one of those cheap Chinese ones, and had to go to the website for instructions. No relay needed, but it didn't work anyway, and now the crappy chrome plastic has gone to hell.
Always use a relay for a high amperage draw, such as headlamps, but any 'motor' must have direct voltage, which is controlled by a relay. Wrecking yards have later model cars with Bosch system, so you can pull 4 prong relays and use them. The wiring schematic is simple, and available on line: Beauty of the relay is it takes .3 amps to energize it...your choice whether the horn button grounds it or powers it: the relay will do what you tell it to. It's like...having an honest attorney between yourself and your wife. Just imagine...
I always use a relay . That way you only have a low-voltage ground runninng into the car to the switch .
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