Horn relay wiring

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ktgarcia

Senior Member
I bought a NORS horn relay for my 1939 Ford Pickup. There are four posts on the back. Two have what I would call a slip type connection. The other two have a bar that has tension where a wire post would be inserted in the hole and the tension bar moves to allow for the connection to be inserted. Once the wire is in the hole, the spring bar keeps it in contact. I assume the spring type connection is where the two wires coming from the horn would go. However, I don't know what the slip type connections would be used for.

There is a mounting bracket attached with a hole to secure the relay to the fender or frame or wherever one would mount it. There is also a curved part of the bracket where I assume the wires would be place and then bent down to secure them.

I have looked at wiring diagrams and I only see two wires connecting to the relay.

I tried to download an image to attach to this thread but wasn't able to get one.

Any explanation of how this relay needs to be wired would be greatly appreciated. Thanks.
 
Most horns have a constant connection to power. and operate when the other side of the circuit is grounded via the button or horn ring.
 
supereal said:
Most horns have a constant connection to power. and operate when the other side of the circuit is grounded via the button or horn ring.
Click to expand...

Not if you are using a relay.

"I bought a NORS horn relay for my 1939 Ford Pickup. There are four posts on the back. Two have what I would call a slip type connection. The other two have a bar that has tension where a wire post would be inserted in the hole and the tension bar moves to allow for the connection to be inserted."

Are there any marks next to the connections? If not, it will take some checking to figure it out. Here is a diagram of how they work.
 

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This is the layout and schematic for your perusal.
 

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Many of the older style relays are designed for use of a male bullet connector. Your description of the attach point seems to match up.
 
Does it look anything like this one? The terminals should be marked H - B - S.
 

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The picture on the right that JSeery sent is what I have. I did a continuity check and the two spring tension connectors have a positive movement of my meter. The two slip type connectors also have a positive movement on my meter. Touching the different terminals (spring tension) and the slip connectors do not make the meter move. With all of the posts, I think I know what I need to do. Thank you to all.
 
The center terminal should be the "B" (Battery) terminal. The smaller one next to it, "S", is the horn wire to the steering column. The two with the clips are the horn wires, "H".
 
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