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Old 12-15-2019, 12:44 PM   #1
ktgarcia
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Question Horn relay wiring

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.
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Old 12-15-2019, 01:12 PM   #2
rotorwrench
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Default Re: Horn relay wiring

The relay likely bolts to the frame. The two grouped terminals should connect to the horns. The other two connect to a battery location and one to the horn contact in the light switch assembly. Here is a link to a standard diagram.
http://www.vanpeltsales.com/FH_web/F...1938-39car.jpg

A lot of 6-volt relays are marked H for horn contact, B for battery contact, and S for switch contact.
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Old 12-15-2019, 01:30 PM   #3
supereal
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Default Re: Horn relay wiring

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.
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Old 12-15-2019, 01:39 PM   #4
JSeery
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Default Re: Horn relay wiring

Quote:
Originally Posted by supereal View Post
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.
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.
Attached Images
File Type: jpg Horn Relay Diagram.jpg (8.0 KB, 26 views)

Last edited by JSeery; 12-15-2019 at 01:54 PM.
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Old 12-15-2019, 02:14 PM   #5
51 MERC-CT
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Default Re: Horn relay wiring

This is the layout and schematic for your perusal.
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File Type: jpg a relay.jpg (152.8 KB, 24 views)
File Type: jpg a relay1.jpg (17.3 KB, 14 views)
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Old 12-15-2019, 02:33 PM   #6
FortyNiner
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Default Re: Horn relay wiring

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.
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Old 12-15-2019, 03:21 PM   #7
JSeery
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Default Re: Horn relay wiring

Does it look anything like this one? The terminals should be marked H - B - S.
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File Type: jpg 001.jpg (15.5 KB, 14 views)
File Type: jpg s-l1600.jpg (39.3 KB, 18 views)
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Old 12-15-2019, 08:25 PM   #8
ktgarcia
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Default Re: Horn relay wiring

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.
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Old 12-15-2019, 10:20 PM   #9
JSeery
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Default Re: Horn relay wiring

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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