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I have 12V in the On Position and 8,9V start before the coil. Is that enough


No, 8.9v indicates that there's a problem in either the key switch or the wiring between the switch and the coil. With low voltage, you're also running the risk of burning out the starter solenoid switch.

If you can't identify a bad connector or wire, replace the electrical portion of the key switch.

Frank


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