I am pretty sure I understand. I will restate my test so you can do it one more time. I was not clear.

1. First, take off battery negative cable off of the battery post until just before test. I will tell you when to put it back on. Keep the positive battery cable on the battery.
2. Make sure the horns are mounted as they were to their brackets and firewall or wherever/however they were mounted.
2. Attach all three wires to the relay. Load-battery-switch. Sounds like you had the switch wire removed for the first test. So reattach.
3. Disconnect the wire on the horns that comes from the load terminal on the relay. Keep it from touching anything while it's loose.
4. Get the meter ready to test for DC voltage.
5. Attach negative cable back up to battery.
6. Test the loose end of the loose wire in no. 3, for voltage.
7. Test all three screw terminals at the relay, one at a time for voltage.
DISCONNECT NEGATIVE CABLE AFTER TEST
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