MightBeDj

Hey all so my horn stopped working checked fuses relays all good when I press panic or lock on key fob the horn works. I'm thinking it's the switch.
I want to by pass the steering wheel pad and put in a momentary contact switch I've looked online an all I found was horn trigger (-) is black where and what color is the positive? And what's a good way to access it?

A second question maybe related or unrelated I believe my MAF is acting up. The engine sometimes would miss/ hesitate idle drop lights dim or stall when in drive with brake applied but in park would be fine. I've cleaned the maf but no result. Could this be a ground issue maybe connected with horn? I'm not sure how to test the maf
Thanks in advance.