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Old 12-15-2018, 09:52 PM   #1
mblue240
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Default Adding Cadillac horns

I had the bright idea to add Cadillac horns to my 240, but now the wiring has me stumped. The Cadillacs only have one horn, so I bought one from two cars. They seem simple enough with a power and ground wire. I hooked them up to the 240 wires though and they honk constant when the ignition is on. I went down to one horn to try and trouble shoot it. When I swapped what I thought was power and ground I blew the fuse when I turned the ignition on. Any ideas?

horns by M. Blue 240, on Flickr
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Old 12-15-2018, 09:59 PM   #2
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I know nothing about this but...

Nevermind

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Old 12-15-2018, 10:40 PM   #3
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Cadillac horns to my 240.....
Volvo's horns do not use vehicle's ground....many GM horns do.

Volvo's horns have two terminals on them...positive juice is running to one terminal once ignition is turned on, or in ACC position....the other terminal connects to a grounding relay.

>honk constant

Yes, this suggests horn is grounded to vehicle....do the horns have two terminals on them?

Here's a diagram of a 1993 Cadillac Fleetwood...from it, it suggests horns are grounded to vehicle where attached.
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Old 12-15-2018, 11:46 PM   #4
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I added a HF ooga horn to the v90 by splice the existing wires. Works great but our wiring is most likely different. Sorry to side track
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Old 12-16-2018, 12:38 AM   #5
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Yes, this suggests horn is grounded to vehicle....do the horns have two terminals on them?
Yes, one green wire and one black. I bench tested it on a spare car battery. Black wire to the negative, green wire to the positive, and horn sitting on the wood bench. It worked just fine, and dang near hurt my ears.
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Old 12-16-2018, 02:41 AM   #6
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I added cadillac horns, just use a simple Bosch type relay to swap polarity.

Google and learn about wiring up a simple relay, worth learning.

there's a good youtube vid about refurbing these old horns using silicone and replacing the rivets with threaded fasteners.
https://www.youtube.com/watch?v=L1kMJIKSEQc

I have the ultimate setup, 4 nautilus type of different notes, and the rare trumpet 5th horn.
you are going to want at least two of different notes, they are marked on the plastic shell, a little googling will lead you down a cool rabbit hole.
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Old 12-16-2018, 01:32 PM   #7
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The older Cadillac horns are 4 horns (4 notes). Not sure how they compare to two horns, but I'm guessing pretty damned loud. It's on my list to do someday.

There's an install page here that explains things well: http://www.local1259iaff.org/cadillac4notehorns.html
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Old 12-16-2018, 06:22 PM   #8
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Originally Posted by mblue240 View Post
bench tested
So, get out an ohm meter....with one lead on metal housing, and then touch each horn terminal.
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Old 12-16-2018, 06:25 PM   #9
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Just adding a relay to the stock 240 setup adds a considerable amount of volume. Not as loud as the caddy horns but totally loud and also do the job well. Another nice update is if you have a late model 240 with only one horn. Back date your car to a set of two horns like the earlier cars have. That and a relay make it very loud.

Yes that is correct. A volvo 240 doesn't use horn relays. Add a relay to your horns, you'll like it.
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Old 12-17-2018, 12:56 AM   #10
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volvo 240 doesn't use horn relays.
My bad...it shows a switch...
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Old 12-18-2018, 03:46 PM   #11
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I added 4 caddy horns to my 88 740 without a relay and it fried my harness. USE A RELAY when adding more than stock.
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Old 12-23-2018, 09:11 PM   #12
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I just finished installing Cadillac 4-note horns in my 242. I put some pics and a diagram in my page here: http://www.240turbo.com/horns.html
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Old 12-26-2018, 03:52 PM   #13
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Installed behind the left side bumper.
Attached Images
File Type: jpg cadihorns10med.jpg (199.3 KB, 81 views)
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Old 12-27-2018, 12:25 AM   #14
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That makes more sense then the way you had them mounted before, in front of the radiator, blocking off a lot of airflow.
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Old 12-27-2018, 09:49 AM   #15
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Quote:
Originally Posted by dbarton View Post
The older Cadillac horns are 4 horns (4 notes). Not sure how they compare to two horns, but I'm guessing pretty damned loud. It's on my list to do someday.

There's an install page here that explains things well: http://www.local1259iaff.org/cadillac4notehorns.html
Dave B
My wife did that on her 4Runner. Took off the little 'meep meep' palm buzzer stock horns, and added the full 4 horn set from a late model big-body Caddy. The big Buicks will also have the 4 horn sets, Oldslowmobiles and Chevrolets siblings only had 2.

It's a full orchestral range now. Very 'full' sounding.
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Old 12-27-2018, 11:43 AM   #16
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Every time I see this thread I think horns on a Cadillac.

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Old 12-27-2018, 02:33 PM   #17
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It's a full orchestral range now. Very 'full' sounding.
It's an F6 chord.
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Old 12-27-2018, 02:49 PM   #18
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Some guy made a video with what they all sound like apart and together: https://www.youtube.com/watch?v=BiVowe2vcPY

A, C, D, F notes.
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Old 12-30-2018, 12:54 AM   #19
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Quote:
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I just finished installing Cadillac 4-note horns in my 242. I put some pics and a diagram in my page here: http://www.240turbo.com/horns.html
Dave B
Thanks Dave, that helps make sense of it all. I have a pair of F horns right now, so I need to hit the yard and find a few more.
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