Just wondering if anyone has had this issue. I recently noticed that the horn on my 66 gives a weak, very short sound when I push the horn button. It doesn't last more than a second and it's barely audible. I checked the manual and the horn seems to run through the headlight switch? Interestingly the passenger side brake light and taillight also is very dim but otherwise functions. I see that those lights too seem to run through the headlight switch. My switch is only a year old. Everything else in these systems is basically new (wiring, lamps, etc.). What could cause this weak horn? And is the headlight switch suspect? Thanks.