1965 Evinrude 90 HP StarFlite Service Manual, PN 4206, Page 87Get this manual
CHARGING CIRCUIT CHECK (CONT) Where To Look Cause What To Do UNDERCHARGED BATTERY (CONT) ALTERNATOR 1Shorted or open windings Disconnect voltage regulator at nylon connector; short across terminals in male connector (engine side)Run motor at 2000 rpm and note ammeter readingNOTEDi sconnect green "ON" light and all accessoriesConnect ohmmeter leads to red or blue lead and groundConnect ohmmeter leads to red lead and blue leadIf ammeter shows charge, replace
regulator
If ammeter shows no charge,
check field and stator windings
aField winding
Infinite readingwinding OK Low reading (less than 5,000 ohms)winding groundedReading 173.1 ohmswinding OK Lower readingshorted winding Higher readingopen winding Infinite readingwinding OK Low reading (less than 5,000 ohms)winding groundedVery low readingwinding OK Infinite readingwinding open
bStator winding