The red arrow is the solenoid terminal. The blue is the terminal for just the starter.
If the person testing your starter is connecting to the blue terminal he is not testing the solenoid.
You can test it your self using jumper cables from a good battery. Just be careful.
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Gordon
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'71 911 Coupe 3,0L
outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage