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No spark on my 1993 , 150 Johnson Fast Strike

Simple steps 1st:
--Make sure your Safety lanyard is securely in place
--Make sure your neutral safety switch is operating properly.

If those are good use the CDI Electronics troubleshooting guide shown below for OIS 2000 ignition systems with no spark to any cylinder:

NO SPARK ON ANY CYLINDER:
1. Disconnect the Black/Yellow stop wire AT THE POWER PACK and retest. If the engine’s ignition has spark, the stop circuit has afault. Check the key switch, harness and shift switch.

2. Disconnect the Yellow wires from the stator to the rectifier and retest. If the engine sparks, replace the rectifier.

3. Check the cranking RPM. A cranking speed of less than 250-RPM will not allow the system to spark properly. This can be causedby a weak battery, dragging starter, bad battery cables or a mechanical problem inside the engine.

4. Verify the engine is turning in a clockwise direction. If not, see TRIES TO RUN BACKWARDS below.

5. Check the power pack and ignition coil ground wires for corrosion and tightness.

6. Connect a spark gap tester to all cylinders.

7. Disconnect the boat side harness and connect a remote starter unit. Check for spark. If the engine has spark, check the boat sideharness’s Black/Yellow wire for shorts to ground.

8. Disconnect the Port 4 pin connector (with the Yellow/Red, Black/Yellow, Tan and White/Black wires) from the power pack and see ifspark returns. If it does spark, check resistance to see if the Black/Yellow wire is shorted to engine ground.

9. If it loses spark after the key switch is disengaged, check the DVA voltage on the stator’s power coil (Orange to Orange/Black) asgiven below in Step #13. Either the power coil or power pack is the fault.

10. Check the battery voltage on the Yellow/Red wire while cranking the engine. If below 11 VDC, charge the battery and check allbattery cables. A continued low battery reading could be from a dragging starter. If still below 11 VDC, disconnect the power pack’sYellow/Red wire from the starter solenoid and apply a verified 12 + VDC to the Yellow/Red wire. If the engine now runs good, checkthe DVA voltage on the stator’s power coil (Orange to Orange/Black) as given below in Step #13. Either the power coil or powerpack is the fault.58 TROUBLESHOOTING GUIDE KEEPING YOUR BOAT ON THE WATER

11. Remove the sensor wheel and check for damage, especially where the top slots are located. Sometimes the wheels will break outwhere the windows overlap.
 
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