Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Could be bad solenoid, but do the same voltage test with the grey wire connected, looking to see if voltage drops!
If voltage drops below 8 volts, check battery and cables.
When key to start position, there is no voltage drop at the battery with grey wire connected. I guess cause engine is not cranking. Oil light is bright.
Solenoid should engage, Replace the solenoid.
Cheeze. Now with start sw on, no volts to grey wire, no oil press lite. Bat volts 12.64 and grey wire attached to solenoid.
What worries me now is that no pwr to grey wire with start engaged. You are right about if there is grey pwr, starter should engage.
Check power to the keyswitch from the fuse. Fuse or fuse holder may not be making good connection.