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FROM the ford transmission book-- test overdrive solenoid --6 amps momentarily,then maintain 2.5 amps, if ammeter maintains a reading of 18-20 amps replace solenoid
the solenoid has 2 windings, and a set of points inside, a high amp pull in winding, then points open ad low amp holding winding
so both the charging system and the overdrive system needs checked for proper operation