5. measure solenoid output power at upper-right terminal. volts = ???
6. measure power at WHITE wire by back-probing terminal at harness ig-switch connector. Might be in different position on your pre-gen harness connector. volts = ???
So far we've measured power (water flow) at points that are
on all the time. Doesn't matter what's downstream, with or without ignition-switch. Lack of power at any of these test points will prevent bike from running. They should ALL measure exact same voltage as measured at start (battery +positive terminal).