Horn Relay question
Thread Starter
Melting Slicks
Joined: Sep 2006
Posts: 2,815
Likes: 469
From: Wichita Kansas
Horn Relay question
I am presuming that the horn relay (on a '72) has to do/affects the horn, but does it accomplish anything else? I don't know what to look at or test to see if it would be worth replacing. Heck, I don't even have any horns [attached] to test that! I did take a light and test the plug that (looks like) goes to a horn and got no response. Thanks. 
Burning Brakes
Joined: Mar 1999
Posts: 1,047
Likes: 3
From: CA
On my 71 its more than a horn relay and buzzer...its also a junction block for positive power feeds. If your unsure, replace it and keep the old one as a spare. I do keep a few spare parts for my car just in case...and the the horn relay is one of them.
Drifting
Joined: Jan 2002
Posts: 1,606
Likes: 1
From: Las Cruces NM
You can test it by listening for a click when it should be activated. With the horns disconnected, if you press the horn button, you should hear and audible click when the relay's triggered. Do it with the stereo and motor off, since either will drown it out.
If you're horn stuff doesn't function, you can jump certain wires to isolate it, assuming there's power to it. I can't recall off hand which to jump and I'm on the road, so I don't have all my stuff on it. Someone will chime in with which wires to use.
C
If you're horn stuff doesn't function, you can jump certain wires to isolate it, assuming there's power to it. I can't recall off hand which to jump and I'm on the road, so I don't have all my stuff on it. Someone will chime in with which wires to use.
C
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
This is only from memory and mine sometimes fails.
You have 3 wires, one live/12 bolts, one ground going to horn ring and one going to the horns.
'When you press the horn ring it grounds the wire causing the relay to close. When the relay closes a pair of contacts are closed and power is sent by the 3rd wire to the horns.
If you jump the live wire and the one going to the horns they will honk. If you jump the wrong wire to the live one, the one grounded to the horn ring nothing will happen since the horn ring is NOT grounded. Just jump away and see if anything works.
You have 3 wires, one live/12 bolts, one ground going to horn ring and one going to the horns.
'When you press the horn ring it grounds the wire causing the relay to close. When the relay closes a pair of contacts are closed and power is sent by the 3rd wire to the horns.
If you jump the live wire and the one going to the horns they will honk. If you jump the wrong wire to the live one, the one grounded to the horn ring nothing will happen since the horn ring is NOT grounded. Just jump away and see if anything works.
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