1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 64Get this manual
1Orangeblack lead 2Orange lead 3High tension (secondary) Figure 4-35Continuity TestPrimary
1Orange lead 2High tension lead (secondary) 3Orangeblack lead
Figure 4-36Continuity TestSecondary
Connect the black lead of the tester to the orange lead of the ignition coil and the tester's red lead to the coils orangeblack stripe ground leadConnect the high tension lead of the tester to the high tension lead (secondary) of the ignition coilWith the tester set to coil index (or operating amperageMerc-OTronic illustrated) adjusted as specified, note meter readingSee Figure 4-37A low reading on the tester indicates weak coil which must be replacedA dead coil will show no reading