??HORN WIREING QUESTION??

[old beet]

Have two new small snail horns, came with a relay and no instructions. Horns each have two posts. The relay has four posts, three vertical, one horizontial. Can anyone show me how to wire them? I,m using a dash mounted horn button. Need to get this Merc inspected, Thank You,.....OLDBEET

[CharlieLed]

Here's the Merc schematic, the relay and horns that you have may differ from this layout...

[old beet]

CharlieLed, Thanks, that enough to get me goin.....OLDBEET

[Mart]

Very often the relay will have a diagram on the side. If so that helps determine which terminal does what.
Mart.

[old beet]

Mart, this one has some numbers, no help to me. I can get the relay to click, but no noise. Don't know why it has four posts, is one a ground? If I hook a hot wire to one side and ground the other, shouldn't it honk? Don't know shit about relays, will just keep playin till somthin burns........OLDBEET

[CharlieLed]

OLDBEET - if you got the relay to "click" then you have obviously found which terminals activate the relay. If you check continuity across the other two terminals I think that you will find that they are normally "open" and "closed" (shorted) when the relay is actuated. If this is the case then connect one terminal to the hot side of the battery and the other to the horns. SOunds like the horns are not grounded through the case though, so you may have to connect the other horn terminal to ground as well. Good luck...

[Rocky]

One of the relay terminals is a ground. That wire goes to the stock horn button and when you poke the horn button, it grounds to the car under the steering wheel completing the circuit and activates the relay, sending juice from another terminal on the relay to the horns. Now, if all ya want to do is pass inspection, simply run a hot wire directly to a spring loaded auto parts store switch, out the other side of it to the horns. Run a ground wire to one of the terminals on the horns and viola! You're in bidness.

[Paul2748]

What kind of button are you using? If it has in/out terminals (power in/power out) you may not even need a relay. Just run the power out to the horns. The two posts on the horn are for ground and power.

[Kustchops]

Hey BEET I will get you a diagram from work. You probably got a square four post relay, bosch type? same as new fords use. Makes the horn work by using closing a ground instead of the juice. We use them all the time at Frieghtliner.

[Rocky]

Hey Kustchops...you work at Freightliner? I usta work at Freightliner on the "off line" doing mechanic work after the inspections.
Always lived in Southeast Portland too. Drove a 64 'Vette I bought from Marvin Booth in Gresham...small world.

[Mart]

Old Beet, I'll try and talk you through without a diagram.
Hold the relay so you got three vertical pins and one horizintal.
The left and right vertical pins are the ones that make the relay pull in. so a live feed to one and the other is connected to the horn switch. The horn switch earths the one pin, the circuit is made and the relay pulls in.
the center vertical and the horizontal pins are the ones that are "made" when the relay pulls in. Heavy live feed to one, (lets say the centre vertical one) and the feed to the horns, t'd to both, ie connected in parallel. Earth the other terminals on the horns and they will sound when the relay is pulled in.

This just in: If the pins are standard, the two that make it pull in are numbered 85 and 86 and the two that switch the power are 30 and 87.

Ok? Clear as mud.
Mart.

[Fatchuk]

Oldbeet I'm gonna try and post a link here that has some good relay info here ,,hope it works..good diaghrams and info.....
[url

or this one
[url=http://www.autoshop101.com/trainmodules/relays/101.html (http://www.the12volt.com/relays/relays.asp[/url)

[old beet]

Everyone Thanks, its starting to make sense now!!.......OLDBEET

[k-member]

Dad, maybe someone can post a pic of the E-Z Wire(tm)brand diagram from the kit, thats what you used. Someone here has had to of used the same brand wiring kit.