Relay Wiring for Air Horns


Information and questions on GL1500 Goldwings (1988-2000)
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pjs1951
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Location: alicante spain
Motorcycle: 1993 goldwing 1500 GL trike

Relay Wiring for Air Horns

Post by pjs1951 » Tue Dec 04, 2018 5:08 am



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 » Tue Dec 04, 2018 9:27 am

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.

pjs1951
Posts: 6
Joined: Mon Nov 12, 2018 2:37 am
Location: alicante spain
Motorcycle: 1993 goldwing 1500 GL trike

Re: Relay Wiring for Air Horns

Post by pjs1951 » Tue Dec 04, 2018 10:28 am

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 » Wed Dec 05, 2018 1:12 pm

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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RockportDave
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Re: Relay Wiring for Air Horns

Post by RockportDave » Sun Dec 09, 2018 9:01 am

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












1999 GL1500SE 5th Goldwing through the years

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