Haynes Thompson

Hello,

I have a 1998 Chevrolet K1500 Suburban with the 5.7L. I'm in need of the horn wiring diagram/illustration.

The previous owner had some wonky wiring going on, and it appears they may have at one time or another installed an aftermarket horn system. However, I have purchased and OEM horn, but the wires (one green and the other black), are terminated downstream of the fuse box/relay etc (if starting from the horn and moving towards the steering column). Tonight I verified that the green and black has continuity from the horn terminal, but now I have no idea where they are supposed to go. I have the Haynes Chevrolet & GMC Pick-ups Online Auto Repair Manual, but this schematic does not seem to be available. Can any one help, please? Thank you kindly.