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Thanks for reading.
The horn is very hard to hear.
Thinking about installing another but not a train, truck or paddle wheeler type. Just need one that is louder.
Anybody else done this?
Thanks.
BillR.
 

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Thanks for reading.
The horn is very hard to hear.
Thinking about installing another but not a train, truck or paddle wheeler type. Just need one that is louder.
Anybody else done this?
Thanks.
BillR.
Make sure your current horn is working correctly. There are two elements, usually G# and B, which comprise a minor 3rd, making the sound just a little more irritating than a major 3rd would be :)

I've had to replace the horns on my truck recently - that's how I learned these fun facts to know and tell :)

In your case, I would start by making sure both elements are driving. Each one has a terminal on it which can be removed by squeezing it to release the lock, then sliding it. Remove one wire, then see if the horn still sounds the same, or is softer. Then test the other. It may be that you have one element which has failed, which will reduce the overall volume.

If one is found to be not working, or if either of them is extra soft, I would take it to the dealer - it should still be under warranty.

If both elements are working, but are soft, there could be a wiring issue, such as a bad relay, but again, that should be covered under warranty.

To isolate a wiring issue, you want to test the elements by bypassing the existing wiring. Disconnect the wire from each element, one at a time, and jumper it directly to the battery. You want to check if it's louder this way, or if it sounds the same.

The ones I put in my truck were touted as being extra loud, but otherwise stock. I got them from Napa. But I didn't see anything listed there specifically for your 2018 Impala. (Altho Napa may indeed have some units which can be used - I got 638 hits listed as "universal" - I bet some of them will work, but haven't yet been linked in the database as crosses.)

Rockauto does list horns for the Impala. I found these two items to be interesting:


STANDARD MOTOR PRODUCTS HN17 {#72102E} Intermotor; High Output, High Tone

STANDARD MOTOR PRODUCTS HN18 {#72112F, HN18T} Intermotor; High Output Low Tone​


These are both listed as "High Output". My experience is that means about +3dB, which is louder, but not extraordinarily louder.

Anyway, I would run it by the dealer first to be sure they're working properly. And if they're still not satisfactory, then consider aftermarket.

One last thought - if you can find a decent place to mount them, you could add another set of horns in addition to the stock ones. Just add some wires from the current horns over to the new ones.

HTH.

Doug

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