find the old horn. it should have 2 wires. find a place to mount the new horn and attach the 2 wires from the old horn to their respective tabs[one should be a fat tab and one should be a thinner metal tab. You cabn buy the little electrical parts that you crimp on the end of the wires to attach to the tabs but really, if you buy good quality electrical tape or better yet-rubber electricians splicing tape[any home depot] just strip the new horns wires and wrap them around the correct tab [it may not even matter if there are only 2 wires.] and just tape the heck out of them so no water can get in [which is why rubber elec. tape is so great. remove your old horn with either sockets or wrenches and your good.