It's actually the 'R' terminal on the solenoid. It gets battery voltage when the start button is pushed (or key). Some use that voltage to bypass the OPSS for electric fuel pump operation during starting but it can be also used to bypass the ballast resistor during starting as well.
I'd suggest if the R terminal bypass is needed, either the resistor is too aggressive or the combination of battery capacity/condition and wiring harness voltage drop need attention.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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