Horn Connection Missing

[Gorilla]

I need a little guidance on how to properly connect a horn. I bought an 03 Silverado that was originally a 6 cylinder truck. Its got a 5.3 in it now with electric fans and 4L80E trans. I noticed I didn't have a high side for the horn. I checked for the wire connector and that is missing as well. I can't find it anywhere.  Not sure if that would have been used for the electric fan or ????

 

Either way I got a wire connector and high side horn. I'm relocating them to the grille area as well. I rooted out the low side wiring and found the green wire and ground that appears to be tied in with other grounds and a piece of heat shrink with dot yellow dashes. 

 

Can anyone tell me how to properly tap the green power wire for the high side horn? I was going to splice the green wire from the low side horn but felt that would be a hack job and didn't want to go that route.  

Would I need to find the horn relay and wire the green wire into that? Is there an easy way to do that?

 

As for the ground I was thinking on just grounding it to frame with the electric fan grounds, battery ground and some other ground thats bolted to the mounting post of the frame. 

I searched around YT but so far havent found exactly my problem on how to go about this. 

Here are some photos of what Ive done so far. 

Edited June 19, 2022 by Gorilla

[richard wysong]

it probably only came with 1 horn so splicing into the green wire will be the easiest way to accomplish wiring another horn. the proper way to do the slice would be to cut the green wire and either solder or use a barrel connector to connect the 3 wires then shrink tube the connection. I squirt di-electric grease into the shrink tube before shrinking to prevent corrosion. as for the ground anywhere you think it's easiest, maybe just to the bracket that mounts the horn if that's grounded