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Reply to "Generator Light"

 Just because the engine cranks and runs does not mean you have quality grounds and connections.  More modern , computer controlled engine management systems run a ground to each sensor.  A few 10ths of 1 volt do make a difference.  

   Connections need to be clean , tight , and mechanically sound.  Wire splices and terminations need to done right.  The toothed lock washers cut into the metal , paint is not a conductor.  Silicone grease they sell at the auto parts for light bulbs is a good addition to inhibit corrosion in the future.

   I confess that I even ran a ground wire from the grounding stud on the altenator to the panel the voltage regulator was mounted on. Remember I now have the internal regulator style alternator but ground is still vital.

   I am a retire electrician .  One motto is , " If you can't fix it with a hammer, it must be elctrical."

    If electrical is a mystery there are good books on the subject.  I have several books by Tony Candella , on basic automotive wiring.  Purchased on Amazon.

amazon.com/Automotive-Wiring-Electrical-Systems-Workbench/dp/1932494871/ref=sr_1_1?crid=3EUGP80HQ7O3Z&keywords=automotive+wiring+and+electrical+systems&qid=1576221706&s=books&sprefix=automotive+%2Caps%2C803&sr=1-1

    There are 2 volumes and a EFI conversion book.

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