How to make a horn relay for '82 diesel?

[Zephyr_shreds]

Can someone tell me how to make a horn relay from scratch please.
Including all the dif awg wires.
Pictures would be cool too.

I’m powering my radiator fan from a fuse box, for all the other wiring involved in the fan speed, then the fuse box attaches to the battery with 8wgwire. Can I tap into the fuse box that I’m using for the radiator to power the horn?

Please help! super duper appreciative if you can.

[0to60in6min]

errr... you want the horn going off when the radiator kicks in...?

how much time do you have on your hands to make a relay from scratch?

https://www.amazon.com/Absolute-Holder-RLS125-Automotive-SRS105/dp/B00C0SATHE?ref_=fsclp_pl_dp_3

[djkeev]

By design, you should have +12 volts at the horn whenever the key is on.

Do You have 12v there?

Also by design, when you push the horn button you are making a ground path for the 12 volts already at the horn.

Sadly, this ground path is often weak due to the design of the path traveled.

Do you have a good ground at the horn when the button is pushed?

If you answered "Yes" to having 12 v but "No" to having a good ground, this is probably why your horn doesn't work.

Test it, take a piece of wire and with the key on, touch the wire to a good ground (spare tire clamshell bolt?) and the ground terminal on the horn, brown wire I believe.
Does the horn honk?
Yes? You need a good ground.
No? You need to check your horn to see if it actually works.

Good news!
You can easily wire in a relay to work the horn using the stock wiring and horn button!

A good ground isn't needed to operate a low draw relay while a good ground is required to honk a horn!

Ideas to wire in a relay......

https://www.thesamba.com/vw/forum/viewtopic.php?t=472190

I went super simple and added the relay at the horn using the stock +12v and ground wires.

Dave
_________________
Stop Dead Photo Links how to post photos

Ghia
http://www.thesamba.com/vw/forum/viewtopic.php?t=392473

Vanagon
http://www.thesamba.com/vw/forum/viewtopic.php?p=6315537#6315537

Beetle
https://www.thesamba.com/vw/forum/viewtopic.php?t=482968&highlight=74+super+vert

[Zephyr_shreds]

Thankyou so much sorry I’m late been kind of busy. This makes lots of sense Thankyou

[Wildthings]

Google "horn relay wiring" and you will be shown lots of schematics on how to do it. You can buy a horn relay for most any rig from your FLAPS or use a single pole double throw relay.