horn stopped working

[sickpuppy1]

This is mostly for CT Scott as he seems to be the go-to man for this stuff. Installed A set of Stebel horns a year or so ago, but they have gone to pot,basically falling apart since then....seperate issue. About 6 months ago, they started working sporadically, sometimes yes sometimes no. Thought it was the horns. Got a new set of horns yesterday and put them in. They worked for a couple of times and then sporadically!!
So to start,yes I have a seperate relay and yes it is wired correctly. What I am measuring is 12 volts to the relay (both the one I used with the stebel and the new one) but it wont pull in the relay all the time. You can measure 12 volts to the relays but they wont pull in. I even went to Oreilly auto and tried 3 different relays off the shelf. It will show 12 volts at the relay when the horn button is pushed,but wont close the relay...voltage but no power. I can even feel the relays kick,but they wont close the contacts. How weird is this....