I just bought some duel tone Hellas and was trying to install them today. I mounted everything and ran the horn wire to the air compressor, but to no avail. I grounded the (-) on the compressor and all. Can someone tell me what I am doing wrong. I can't seem to get this to work. Isn't the wire going to the factory horn positive. It was said to be an easy install...help me, help me please! :?