i have a 1995 sierra 2500 gas series. then my horn and my washer fluid arent working. i cleaned all my ground posts. put in new fuses. wen i hit the horn you can hear the relay switch clicking. and when i first went to use the washer fluid it squirted once then stopped. i checked and cleaned all ground posts. i also used an ohm meter on both horns plugs theres power coming to the horns??? thats so confusing any one have any ideas???