As a level set we are talking are troubleshooting a 69 Camaro with a SBC. I am finishing a frame off and everything in the electrical system is new: AAW Classic Update harness, ignition & headlight switch, solenoid, starter, neutral safety switch, battery & cables, fuses, etc. The car has been started & ran multiple times this year with no problems.
Last weekend I was tuning the motor and I started having an intermittent starting problems, but I did start the motor and let it run multiple times. I would turn the key and starter would do nothing. I traced it down to the neutral safety switch. I get it adjusted, then I decide to get back to tuning the motor. I turn the key and the starter would engage, but not crank the motor. I assumed the starter solenoid was shot as I had problems with it in the past. I pulled the starter and had it bench check at Advance Auto and it was bad. I bought a starter for late 90s Chevy 2500 series truck with a 454 (mini starter). After installing the new starter I am having the same problem, the start is engaging, but it does not crank the motor.
I checked my voltages and here is what I am reading:
~ 12.6 vdc @ battery
~ 12.3 vdc @ red wire into ignition switch (battery)
~ 12.2 vdc @ pink wire out of ignition switch with key turned to start.
~ 7.75 vdc @ purple wire out of ignition switch with key turned to run/start (goes to neutral safety switch)
~ 7.75 vdc @ S terminal of starter solenoid which has been relocated to trunk
~ 4.99 vdc @ starter
I don't know why the voltage is dropping to 7.75 vdc on the purple wire coming out of the ignition switch? I tried adjusting the ignition switch and even got a new one, but the problem still exits and I am reading 7.75 vdc.