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The stock horn is grounded through the bolt that attaches it to the engine bay. That's probably the other wire you're looking for. The new horns (assuming you got the same horns as I did) each need a positive and negative lead (from the harness). The remaining two (positive and negative) wires...

No, harness and bolt were the only things purchased besides the horn. You'd need a socket set to do all this, but that's pretty easy to borrow from someone if you don't already have one. Yes, I was able to do all this without removing the grille. There's quite a bit of space to work.

You mean wiring up the other horn? Or just getting it to light up?

It was pretty straightforward after i figured out that (a), I needed a harness to covert my single stock horn to trigger the Hella Twin Tones, and (b), had my buddies explain to me how the harness worked. I used this one...

Hopefully this helps, it's the product page on amazon. Not sure what they mean by "one relay" in the description. Maybe that's it?

Does that not burn your hand in the summer and/or cause frostbite in the winter? :P Interesting look for sure.

Sorry for bringing up an older thread, but I'm looking into swapping out my stock horn for the Hella twin tones. It looks like what you did is exactly what I want to do. I'm mainly looking for details about the installation and whether I need to get anything else besides the horns...

Hello, Just thought I'd sign up for this thread in case anything interesting popped up. I've got a 2016 Corolla S M/T, bought it brand new and loving it so far. I'm not too keen on modifying it, I actually REALLY like the look of it stock. That being said, some of the ones I've seen on this...