I have a frame off 67 roadster and the only three things on the car that don't work are the amp gauge, brake lights and horns. I replaced the horn relay with an NOS 837 and they make a grunting noise, but not a clear horn noise. Could there be a singular common problem with all the problems, meaning one problem causing the amp gauge, brake lights and horns not to work. I am going to put a new brake switch in next week. I have an NO amp gauge (not sure how much of a pain it is to get the old one out). Any help or insight would be super-appreciated. Thanks ARA
