I have a 7fgcu20 serial number 61316 with a horn that doesnt work. The fuse is good and the horn itself is good but i cant seem to find any power anyplace else. Do these have a horn relay if so where is it? Does any body have a wiring schematic for the horn circuit? If so it would be greatly appreciated if you could email it to loewen12 at hotmail dot com. Thank you very much in advance.