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Thread: Cadillac Horn Mod

  1. #1
    Carthago delenda est Lutrova's Avatar
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    Default Cadillac Horn Mod

    I've procured a set of four-note Delco-Remy horns from the junkyard and would like to swap them into the Lincoln. Mounting issues aside, my plan is to wire them up in sequence using a stock harness from an Eldorado and run that wire back to the horn relay. Someone elsewhere on the internet felt that these horns will draw maybe 5A each. I believe the stock horn relay is good for 20A and the horns and cigar lighters together are on a 20A fuse.

    Should I be upgrading the relay or putting these horns on a larger or separate fuse? Or will the stock wiring support them?

  2. #2
    Road Warrior Kodachrome Wolf's Avatar
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    While not a Box, I fitted the same setup of horns on a '99 CV and used the stock wiring, save for where I removed the connector and spliced a daisy chain of spade connectors together to send power to the horns. Despite the horns also just using a chassis ground, I also daisy chained a ground wire linking them together back to the factory ground, just in-case the support I attached them to wasn't 100%.

    Noticed no issues or blown fuses, so I'd say run with what you have.

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    I'm an air-conditioned gypsy gadget73's Avatar
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    do both of the horns live in the same fender on a Towncar or is it one in each side? I honestly don't remember.

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    Beater gonna beat sly's Avatar
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    I'd trigger a relay with the stock horn circuit to drive all of that with a dedicated line from the battery just to cover it. Also... 20A should be peak for 4 horns. I think typical is about 1-3A per horn. But 10A fuse per pair of horns should be about right for covering the electrical requirements.

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    GMN Regular DerekTheGreat's Avatar
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    Quote Originally Posted by gadget73 View Post
    do both of the horns live in the same fender on a Towncar or is it one in each side? I honestly don't remember.
    One in each fender.

    For the longest time, even when adjusted within resistance spec, both of my horns were pulling over 20A. Aside from the starter motor, I'm pretty sure the horns draw the most current. Perhaps only superseded by the blower motor.
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  6. #6
    Carthago delenda est Lutrova's Avatar
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    I've given the wiring diagram a good deal of scrutiny tonight, and it looks like the stock wiring is very nearly a dedicated circuit just as it is. The only other thing on the same fuse is the dash cigar lighter. Used to light a cigar I could see it drawing some good current, but as a USB/phone charger it's probably not putting much stress on the fuse at all. From the fuse a wire runs out to the horn relay, which can also draw horn power from the anti-theft system, and then out to the separate harness in front of the header panel. There's a connector to this harness right beside the relay. This would probably be the connector to re-pin with the Cadillac horn harness.

    If the four-note horns draw no more than 20A, the stock wiring and fuse should be sufficient. If they draw more, then I think you'd not only need to run a separate line from the battery, but you'd also need to beef up the wiring to and from the anti-theft module, which has its own set of fuses.

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    Stow It! GM_Guy's Avatar
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    Just fyi, cadillac uses a 20amp horn relay as well, I wouldn't sweat it.

  8. #8
    Carthago delenda est Lutrova's Avatar
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    Well that seems pretty definitive then. Honestly not as much work as I expected it to be. Finding the right spot to mount the horns is maybe the hardest part of the operation.

  9. #9
    Stow It! GM_Guy's Avatar
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    Close to the stock location works real good. When I added horns to my truck I put them down low up front in the engine compartment and the sheet metal has the added bonus of acting like a speaker, definately adds to the overall tone vs just being mounted ahead of the radiator, and it keeps them out of the water spray.

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