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That part of the job of the MPU. When the engine is up to speed and the MPU detects the RPM and causes the starter to be disabled. It also enables flashing at the same time.It’s a good thing that with the unit running I can switch to start without running the starter
Based on your measurements it indicates K15 is the problem.
Odd because relays rarely fail.
What should be happening is K15-7 gets 24 volts when the engine is up to speed.
When you move S1 to START K15 closes and should pass the 24 volts on terminal 7 to terminal 4.
However you are measuring 0 volts on K15 terminal 4.
I did swap out the relays K14 with K15 same problem although when I held S1 in start I do get 120 volt to the convinces outletI just woke up, and started reading this before I go back to bed. Swap K 14 and K15. See if your symptoms change.
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