It is 46 degrees outside and very foggy and moist. I just installed a set of “GG” train horns in the bed of my truck yesterday. This morning I woke up and got on the main road and the horns would not sound. I kept messing with it, pulled over, checked the wiring and so on (I could not hear the valve click open). Every now and then I can get it to make a shrill toot. I am running them at 200 psi, what should I check first? Diaphagms are not damaged, I am guessing that I should wire it into a toggle switch instead of the stock horn switch or it is a bad valve on a brand new horn? Yesterday I used the hell out of it with no problems.
Could it be a ground issue?