I have an 2002 4x4 duramax 2500HD extra cab regular bed. I have a ranch hand front bumper replacement on it. My horn went from sounding normal then went week for a few months and now nothing. Where is the horn located is there only one or are thier two? Also is there a seperate fuse for them or is there a relay somewhere?

Should be 2. 1 under each headlight.