[big job]

Lets see turn ign on amp shows a little discharge thats good that means coil juice. step on the starter amp gauge shows 0 and nothing happens. And mentioned to turn on headlights then step on the starter do the lights go out: yes or no. If yes you had better check cables with a test light. If no its the starter switch known bad out of the box. If you
took that switch apart I bet the disk and contacts are all black and its getting a little
sizzle contact to kill the coil but not enough power for the starter &
(amp meter goes to 0) thats a red flag. We built a test stand for V8s have that starter
switch all common to tractors industrial engines. the first push Junk. So I say take the
starter cable off and with test light on that cable now press the switch does test light
glow ? if yes now ground that cable and I bet the light will go out. starter switch juck.