[Mgs] Intermittent horn

[Joseph Cianciotti]

I have a recurring problem with my MG's horn. Yesterday, it worked and then 
didn't, then did again. I've tried to isolate the conditions. And typically it 
seems like it works when the car is driving, but rarely when it's idling and 
never when the car isn't running. In the non-working situations, I get an anemic 
sound or nothing at all. I have an alternator so my electrical power is 
consistent. And in the past, I've replaced the horns with new ones to no effect. 
Any suggestions? Thanks,

Joseph
'67 MGB Roadster