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Old 05-12-2019, 01:57 AM   #1
ryanguy426
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Question Another 3 to 2 wire horn conversion thread

I know this has been talked about plenty of times, but I haven't found any solid information on the required relay specifications.

I understand the entire wiring process, and how to hook up the relay. However, I've seen one or two threads saying there needs to be a specific resistance on the relay, or the horn buttons in the steering wheel will get burnt up. 500 ohms is what I've seen, however I also can't find any relays with that high of resistance. The highest I've found is 90 ohms. Would that still be okay, or does anyone know of a specific one that will work safely? The one from All Electronics in Richpin's video isn't sold anymore.

Thanks for any input

...
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Old 05-12-2019, 04:07 AM   #2
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Default Re: Another 3 to 2 wire horn conversion thread

RockAuto has 4 pin relays..

https://www.rockauto.com/en/tools/el...ion+relay,3608

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Old 05-12-2019, 08:40 AM   #3
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Default Re: Another 3 to 2 wire horn conversion thread

"normal" relays only have 50-90ohm's resistance on the coil, the load the horn button's see.

This one has 350ohms as well as a diode built in across the contacts (also recommended) (relay spec's in attachment): https://www.amazon.com/HELLA-0079030...dp/B004NIKZEG/

Hella relay specs are found in this document: https://www.hella.com/hella-us/asset...cs_Catalog.pdf
Attached Images
File Type: jpg Hella 007903021 Relay.JPG (141.6 KB, 4 views)

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Old 05-12-2019, 09:04 AM   #4
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Default Re: Another 3 to 2 wire horn conversion thread

I just used a normal relay I bought off Amazon.
http://www.saturnfans.com/forums/sho...&postcount=103

http://www.saturnfans.com/forums/sho...&postcount=107

OldNuc's warning:
http://www.saturnfans.com/forums/sho...&postcount=108

Works good so far. Another option would be to search through digikey or mouser to find a relay that takes less than 5ma to run that would run the coil of the big relay.

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Old 05-12-2019, 11:08 AM   #5
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Default Re: Another 3 to 2 wire horn conversion thread

Here is a $5 relay with less than 5mA of current required for the coil. It can handle an amp on its contacts so that would close a normal relay no problem.
https://www.digikey.com/product-deta...1895-ND/385898

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Old 05-12-2019, 06:37 PM   #6
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Default Re: Another 3 to 2 wire horn conversion thread

Quote:
Originally Posted by fetchitfido View Post
"normal" relays only have 50-90ohm's resistance on the coil, the load the horn button's see.

This one has 350ohms as well as a diode built in across the contacts (also recommended) (relay spec's in attachment): (link deleted)

Hella relay specs are found in this document: (link deleted)
That one looks great, however it's a 24v relay and it wouldn't be able to be switched by our 12v system if I recall my (basic) understanding of relays correctly. It seems that's a majority of the relays out there that meet the specs are 24v.

Quote:
Originally Posted by Waiex191 View Post
I just used a normal relay I bought off Amazon.
So as long as I test the relay resistance with a multimeter before hooking up the actual horns to it like OldNuc says, any random one off Amazon should suffice? Everything else is clear to me, just the relay choice is what I'm concerned about.

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Old 05-12-2019, 07:09 PM   #7
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Default Re: Another 3 to 2 wire horn conversion thread

I bought these:
https://www.amazon.com/gp/aw/d/B01M7...?ie=UTF8&psc=1

I don't believe they meet OldNuc's specifications for coil resistance or current draw. I took a gamble and haven't lost yet. But if you also buy that little $5 relay, and use it to run the Amazon relay, you would be good. Just make sure you use a diode for suppression on both coils.

...
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Old 05-12-2019, 07:52 PM   #8
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Default Re: Another 3 to 2 wire horn conversion thread

When it fails is a function of the use of the horn.

It is not real difficult to find relays on eBay that have a 700+ ohm coil and the power contacts are rated at 30A. The foil contacts in the gen-2 will handle about 50 to 75ma if the arc is suppressed properly.

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