OMC Wiring Diagrams., Page 46Get this manual
1979 240 HP PRE-SET TRIM MODELSJ
DIAGRAM KEY
ALL WIRES ARE18 GAUGEEXCEPT WHERE SHOWN -BLACK WHITE x.x.x ,?GREY, :-ORANGE AND ORANGEANDORANBE AND ORANGE AND RED -DARKGREEN -YELLOW -GREEN AND WHITE LH - .I BLUEAND WHITE AND BLACK PURPLE noPURPLE AND RED -PURPLE