i have a 1995 sierra 2500 series 5.7 gas engine. 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 took out the horn and the pump hooked them up to a battery and they both work. i cleaned all my ground posts with no go. any clues???
Sounds like you need to check for power coming from the relay if you grounds are good. No power means you need to trace the wiring back to see if the wire/s are broke, etc.
http://www.freeautomechanic.com/wiringproblems%206.html
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