I have a 1988 Isuzu trooper and the horn does not work. I told my Dad I would fix it but I can't even find where the horn is under the hood.
can someone please help me here? I have a manual but the horn is not even listed in the book at all.

it's behind the grille near the passenger side headlight.

there is even an extra connector and mount hole so if one was inclined, two horns can be hooked up at once.