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[razzo]

car failed mot as the horns were not working, relay seems ok as i can hear it click & fuse is intact put a volt meter across horn terminals & get 0v out of one connector & 5.2v out the other, any ideas where to go from here? tis a 97 elite

[05omegav6]

Try unbolting them and clean up the mounting, reattach and try them again

[TheBoy]

You often get the wires corroding about an inch or so from the connector...

[Martian]

car failed mot as the horns were not working, relay seems ok as i can hear it click & fuse is intact put a volt meter across horn terminals & get 0v out of one connector & 5.2v out the other, any ideas where to go from here? tis a 97 elite

Just because the relay is energising, it doesn't mean the contacts aren't pitted to the point where they can't switch the high current required.

[razzo]

working relay swapped over from another car with working horns & still no joy

[TheBoy]

It does have a dedicated fuse, worth a check (fuse, IIRC, is just in the horn power circuit, not the circuit that energises the coils).

[razzo]

thanks for all the advice, turns out one of the wires had been trapped in previous life & had just been taped up, eventually corrosion set in & wire failed. So now have 12 months MOT on it, just one more question, i only managed to get one horn working as when i plugged in the second horn neither would work, disconnect second horn & first horn works. Not too fussed just curious as to why?