As said numerous times above you must have 12V during both the "start" (key in "start" position) and "run" (key in "on" position). The best place to tap into this is where they meet at the now unused ballast resistor. I had a truck with a 6AL and somehow the "start" circuit stopped working. It took me a while to figure out that my intermittent no start condition was actually the MSD box not being turned on while cranking. Everyone and a while the engine was rolling over enoughwhen the key went back to "run" that is would light. The key buzzer story is very funny!