Are you taking your live feed for the ignition etc. from the starter motor live terminal or battery side of the solenoid.
If you take it from the solenoid live feed and the solenoid is dodgy you can get problems.
Also the 3 volt drop at the coil when cranking is similar to the voltage drop with a ballast resistor. Some vehicles have a resistor in the line to the coil as standard, may need some investigation.
Phil
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