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Old 03-13-2007, 07:59 AM
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wiring horn

I'm trying to wire a horn. I wired it to the fuse box and when the key's on the horn honks without the button being pushed. oops! Anybody got any ideas? John

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Old 03-13-2007, 09:32 AM
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There are several methods to wire a horn.

The safest is to use a relay as the horn will draw a high current.

To straight wire the horn without a relay here are two methods.

Hot wire to one terminal of the horn button, then from second terminal of the horn button to one terminal on the horn. Second terminal of the horn to ground.

Second method is hot wire to one terminal on the horn, then from second terminal of the horn to one terminal of the horn button. Second terminal of the horn button to ground.
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Old 03-13-2007, 01:26 PM
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wiring horn

Thanks for the reply, Frisco. I'm going to try that today. There's only one terminal on the horn so I'll use your hot to button and horn to button method. The horn is grounded to the chassis. Thanks again, flyboy26
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Old 03-13-2007, 05:14 PM
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Doc here,

You Should always use a horn relay for two very specific reasons:

One, it relieves the load on the switch gear on the horn button, which is nothing more than a "motor brush" type arrangement to ground when pushed and provides GROUND to the relay NOT a high powered horn..(can draw up to 40 amps!) and you don't want to be pulling the wheel apart to replace it every few months..

AND TWO, If it is a stock horn button...and you try to run power through it, when you push the horn ring..you have a DEAD SHORT to ground.

To install a horn relay:
  • RELAY COIL #85 = to 12 volts UN-SWITCHED, Fused power. 14 gauge wire.
  • RELAY COIL GROUND #86 = to the horn ring button. 14 gauge wire.
  • RELAY CONTACT NORMALLY OPEN # 87 = To a FUSED battery connection (hot at all times) 10 gauge wire.
  • RELAY CONTACT CENTER WIPER# 30 = to the horn direct. 10 gauge wire.

    RELAY CONTACT 87A = NOT USED FOR THIS APPLICATION



You can get a relay at the parts store (for about $25 fazools), or buy one cheaper at rat shack for about $7 fazools..
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Old 03-14-2007, 07:46 AM
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Thank you doc. I have no doubt you're correct about the relay but this is for an 87 year old man who can't even drive his truck anymore. It just sits in his driveway. The button is mounted on the dash and is easy to get to and I'm quite sure it'll outlive him. I will remember it though when I install another. Thanks again, flyboy26
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