1971 Evinrude StarFlite 100 HP Outboards Service Manual, PN 4753, Page 89Get this manual
Figure -14Checking Rectifier Diodes
YELLOW rYELLOW AND GREY TRI PE
A test light may be used in place of meterUnder no circumstances use any test meter or instrument with more than 12-volt source1Disconnect rectifier leads (yellow, yellowgray stripe, red) at terminal blockConnect one ohmmeter (HI ohms scale) lead to yellow rectifier lead, and other meter lead to groundNote meter readingSee Figure 7-14
2Reverse test leads and again note meter readingAn infinite (very high) reading in both checks indicates the diode is openA zero reading in both checks indicates the diode is shortedA normal diode will show reading in one direction and no reading in the other direction3Repeat this procedure with rectifier yellowgray stripe lead4Repeat test, connecting meter between rectifier yellow and yellow gray stripe leads and the rectifier red leadTo check stator windings, disconnect the yellow and yellowgray stripe leads at the terminal blockSee Figure Connect the meter lead to yellow lead and other meter lead to ground to check for shortsAn infinite reading on HI ohms scale indicates the windings are goodFigure 7-15Checking Alternator Stator Connect the ohmmeter (LO ohms scale) between the yellow and yellow gray stripe leadsA reading of .75 ohms .2 indicates the windings are good, and an infinite reading indicates the winding are openSee Figure 7-15REPLACEMENT OF ALTERNATOR