If the relay under the dash clicks the ground connection is good. The 12 volt feed is good too because it feeds both the relay coil (which is working) and the relay contact. That leaves pitted relay contacts, the horns, (did two fail at the same time?), Or the wire going to them.
The next step is to unplug one of the horns, then measure the voltage on the wire when a helper presses the horn switch.
Thursday, March 3rd, 2011 AT 4:29 AM