1978 Evinrude Outboards 9.9/15HP Service Manual, Page 43Get this manual
SENSOR COIL OUTPUT TEST Set meter switches to "s" and 5Insert meter black lead probe into cavity "B" of four wire connector from armature plateInsert meter red lead probe into cavity "C" of four wire connector from armature plateSee Figure 4-27Crank engineObserve meter readingreverse meter leads, crank engineMeter should indicate 0.3 or higherNo or low reading, on either check sensor coil for shorts to groundTo check for shorts to ground, remove black meter lead from cavity "B" and ground to armature plateSee Figure 4-27Crank engine and observe meterRemove lead from cavity "C" and insert into cavity "B Crank engine and observe meterAny reading on either test means sensor coil is shorted to groundLocate short and repair or replace sensor coil , ,