View single post by Jim Ketcham
 Posted: 08-17-2013 10:18 pm
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Jim Ketcham

 

Joined: 03-13-2005
Location: Salt Point, New York USA
Posts: 208
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 Answerman is correct. The yellow/white wire provides 12v to coil bypassing ballast resistor only when starter solenoid is engaged, otherwise power comes from tach thru ballast resistor to coil. Tach will work fine without this y/w connected to starter solenoid. For those people not using an external ballast resistor this connection is not needed. As a matter of fact, for those using a Pertronix system connecting this will often pin the tach during starting.