Q: How to troubleshoot and replace a non-functioning horn on Lincoln Town Car?
A: First of all, should the horn not blow, check the Fuse and the Relay. You must ensure that the horn bolts and ground wires are tightened. Also, connect jumper wires from the bracket bolt to the negative battery terminal and the horn terminal to the positive terminal. Should the horn not sound after disconnecting these wires, adjust the screw by turning it anticlockwise or replace it with another good one. To replace, disconnect battery cable, electrical connector, and mounting bolts, then lift horn out of the vehicle.