Relay Wiring for Air Horns


Information and questions on GL1500 Goldwings (1988-2000)
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pjs1951
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Relay Wiring for Air Horns

Post by pjs1951 »



I have been checking on line for a wiring diagram for wiring a Relay for my Air Horns. Can someone please tell me the correct way and what size wire to use. If you have ever looked on the web there must be 20 or more different ways to wire the relay. So please tell me if you can the correct way.


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WingAdmin
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Re: Relay Wiring for Air Horns

Post by WingAdmin »

The existing horn circuit looks like this:

Existing horn circuit
Existing horn circuit

On my GL1500, I tapped into the wire that leads to the right horn. I left the existing horns in place, for two reasons:

1) They work well, and make the horn (with the air horn) even loader
2) They come on instantly, whereas the air horn takes a few tenths of a second to come up to pressure and sound

Here's how I tapped into the circuit:

Add relay for air horn
Add relay for air horn

I used a standard 40-amp automotive relay, the terminal numbers are the ones printed on the bottom of the relay. I tapped into the light green wire feeding the right horn, and connected it to the coil of the relay, terminal 85. The other side of the coil, terminal 86, goes to ground. This wire can be 18 or 20 gauge, it doesn't carry much current.

I then used a 14 gauge wire, fused right at the battery (always put the fuse as close to the battery as possible), to feed the contacts of the relay. It goes into terminal 30 of the relay.

Terminal 87, the other side of the contacts, feeds another 14 gauge wire to the air horn compressor. The ground of the compressor uses another 14 gauge wire to go to ground (a good, solid spot on the frame). It's OK to share this with terminal 86 of the relay if needed.

Some relays may have a fifth terminal, 87a. If yours does, it remains unconnected.

Make sure to insulate the terminals of the relay well, to prevent them from shorting out. Or better yet, do what I do, and use a relay socket like this:

https://www.amazon.com/Absolute-SRS105- ... B005EUWMU2

That way you know there won't be any shorts, and if the relay ever fails, you can just pull it out and plug in a replacement.
Find This Item on Amazon:
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pjs1951
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Re: Relay Wiring for Air Horns

Post by pjs1951 »

Hi, Thank you very much for the info, that looks a lot clearer to me than any other I have seen.
Thank you stay safe.
Paul
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virgilmobile
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Re: Relay Wiring for Air Horns

Post by virgilmobile »

A side note:
If you use a relay with the 5th connection(the unused blade in the middle) reverse the wiring on 30 and 87.
On the 5 terminal types,at rest, terminal 30 and 87a are connected..if 30 is used for main power the center blade (87a) also has main power on it.
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Re: Relay Wiring for Air Horns

Post by RockportDave »

I added a WOLO Bad Boy on mine and followed their instructions. The same as WingAdmin, I spliced into the OEM wiring on the left horn so my factory horns still work. I ran the fused power to the relay and ground from the horn direct off the battery.
Dave










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Bonnie and Clyde
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Re: Relay Wiring for Air Horns

Post by Bonnie and Clyde »

Ok I give up, Im flummoxed and in a complete head scratcher. I have a Stebel air horn. Came with a 4 prong relay 30,85,86,87 (there is a middle 87 but no prong like it was cut off at the factory)

I have tapped into left horn light green and dark green 2 wires. Have them mounted in 86 and 85.

Air horn is grounded to frame and positive to 87

30 is powered coming out of accessory fuse box (Not off battery would that make a difference?)

I get power to the relay

when I hit the horn button all i get is stock horns.

Number 85 gets power at the relay when the button is pushed

Vodooo the is electrical stuff
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Re: Relay Wiring for Air Horns

Post by Bonnie and Clyde »

Ok so if I take 85 off the relay leave all else in place. Obviously when I hold it to the horn power when I hit the button it works but the stock horns sound anemic

Do have a bad relay? Or more likely I have it hooked up wrong?
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Re: Relay Wiring for Air Horns

Post by Bonnie and Clyde »

10-22 crisis averted.........it was a bad relay new out of the box. After hours of chasing my tail I finally decided to tap on the relay with a screw driver. It worked........then it didnt then it did. Ran down to the auto store new relay installed and it works as I mentioned wired above. I hate electrical and plumbing stuff..


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