1967 Evinrude StarFlite 80 HP Outboards Service Manual, PN 4359, Page 86Get this manual
CHARGING CIRCUIT CHECKS (CONT) Where To Look Cause What To Do Result
UNDERCHARGED BATTERY (CONT) RECTIFIER
1Defective rectifier diodes (on
Disconnect diode leads then check each diodeConnect ohmmeter leads to positive diode leads and insulated heat sink, then reverse leadsConnect ohmmeter leads to negative diode leads and ground, then reverse leadsBattery polarity
High reading on one check and low reading on other diode OKLow reading on both checksdiode shortedHigh reading on both checks diode open
ALTERNATOR
1Shorted or open windings
Disconnect voltage regulator at nylon connector (15 amp alternator)Run motor at 30003600 rpm and note ammeter readingNOTEDisconnect all accessories
If ammeter shows
charge, replace regulatorIf ammeter shows
no charge, check field and stator windingsInfinite reading winding OKReading at 1 ohm .2 (15 amp alternator) ohms .2 (6 amp alternator)winding OKInfinite readingwinding openIf ammeter now