1970 Johnson 115 HP Outboard Motor Service manual, Page 90Get this manual
REFERENCE PICTURES
Figure 7-14Checking Rectifier Diodes 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, yellow gray stripe, red or red yellow stripe) at terminal blockConnect one ohmmeter (HI ohms scale) lead to yellow rectifie lead, and other meter lead to groundNote meter reading
2Reverse test leads and again note meter readingAn infinite (very high) reading in both che('.o- indicates the diode is openA zero reading in both checks 1iode is shortedA normal diode will show reading in one direction '10 reading in he other direction3Repeat this procedure with ctifier yellowgray stripe lead,
4Repeat test, connecting meter between rectifier yellow and yellow gray stripe leads and he rectifier red or redye llow stripe lead