Horn burnt out

[mvons]

Hubby took the time (because it was above 50F, no garage here) to multimeter volt test and when he pushes the horn button, we hear the relay click and the green line to the horn shows just under the 12 volts and zero when horn button isn't pressed. He tested the horn at the battery and nothing, thus horn burnt out. I just ordered cheapy horns off Amazon so if this problem continues we aren't out $16 a horn.

The only thing we did different this time is we put in a new horn relay and mounted it to the floor pan, where before this horn burnt out, the horn relay was just dangling. Does anyone know if that was our problem and the horn relay has to be mounted/grounded to the chassis? We are hoping that was the problem and the latest horn won't burn out.

I know the last relay was probably fine because we heard it clicking. The horn worked 3 times, the truck was driven 3 times for only 20 minutes - we won't talk about gas consumption on a small trip to the dump in the winter. So hubby replaced the horn relay and this time mounted it and now will replace the horn this weekend (darn winter sun goes down too quick).

72 K20 chevy