It is possible to repair your T-Bird horn because the top just snaps on and off. You can remove it by placing a screw driver in the slot on the side of the top the part that has "Spartan" embossed in it), then simply pry it up. Inside you will find a set of contacts which need to be filed with a point file. Loosen the locknut above the points then with the horn connected to a battery adjust the center slotted screw with a screwdriver until its so loud you can no longer- stand it. Tighten the locknut and replace the cover. Beep to your hearts content!!