I have 3 horns and the only one working is the bottom long one. The 2 round ones are not. I played around with the connections and they seem ok. I tried to check for power but not sure I was doing it correctly. Any suggestions? 

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There are adjustment knobs on the horns. Might be turned to far one way or the other. First, if testing on the car I would give the bolts that hold them to the radiator support an extra tug to make sure their serrated flange head is digging into the metal and making a good ground. Then I would disconnect the connector and run a wire direct from 12 volt + side of battery to the horn connector. If no sound, try turning adjustment screw one way then the other. They can be hard to turn and I usually use small vice grips if they don’t turn freely. If still no sound horn may be bad. If they start working you are good to go, reconnect horn connector and recheck at steering wheel.
If you got sound with direct feed from battery, check horn connector, cleaning if needed. If the one lower horn is working you at least know you are getting the 12 volt feed from inside car to horns and must be wiring or connectors at the horns. Bench testing is the same except you would have a ground connection from power source ground to metal horn housing or bracket.

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