boat parts

Outboard ignition parts for Mercury Mariner outboard motors. Power pack, stator, timerbase, regulator.

spark plug.gif - 325 Bytes

Contact

 spark plug.gif - 325 Bytes

Returns

 spark plug.gif - 325 Bytes

  Cart  

 spark plug.gif - 325 Bytes

Troubleshooter

 spark plug.gif - 325 Bytes

 FAQ  

Select your motor

warranty 		corner.jpg - 1145 Bytes
Page 10 - Index - Page 12
Two Cylinder Engines
1996-2000
Engines Using a Combination Switch Box and Ignition Coil (CDM Modules)
No Fire At All:
  1. Disconnect the black/yellow kill wires from the harness and retest. If the engine’s ignition fires now, the kill
  2. circuit has a fault-possibly the keyswitch, harness or shift switch.
  3. Swap the White/Green and Green White stator wire and retest. If the problem moves to the other cylinder, the
  4. stator is likely bad.
  5. Disconnect one CDM module at a time and using a set of piercing probes and jumper wires- short the stator and
  6. trigger wires to engine ground. Retest. If the other module start firing, the one you unplugged is bad.
  7. Disconnect the yellow wires from the stator to the rectifier and retest. If the engine fires, replace the rectifier.
  8. Check the cranking RPM. A cranking speed less than 250-RPM will not allow the system to fire properly.
  9. Check the stator resistance and DVA output as given below:
  Wire Read To Resistance DVA  
  White/Green Green/White 500-700 180V or more  


No fire or Intermittent on One Cylinder:
  1. If the cylinders are only acting up above an idle, connect an inductive Tachometer to all cylinders and try to isolate the problem cylinders.
  2. Using a set of piercing probes, check the trigger DVA output as given below:
  Wire Read To Resistance DVA  
  Brown
White
Brown		 White
Engine Ground
Engine Ground		 800-1400
Open
Open		 3V or more
1V or more
1V or more		  
  1. If # 1 is not firing, swap the White/Green and Green White stator wire and retest. If the problem moves to the #2 cylinder, the stator is likely bad. If no change, swap locations with #2 and see if the problem moves. If it does, the module is bad. A continued no fire on the same cylinder indicates a bad trigger.
High Speed Miss:
  1. Connect an inductive Tachometer to each cylinder in turn and try to isolate the problem. A high variance in RPM on one cylinder indicates a problem usually in the trigger or CDM module.
  2. Perform a high-speed shutdown and read the spark plugs. Check for water. A crack in the block can cause a high speed miss when the water pressure gets high, but a normal shutdown will mask the problem.
  3. Remove the flywheel and check the triggering and charge coil flywheel magnets for cracks or broken magnets.
Three Cylinder Engines
Mercury Designed Ignitions
1992-1997

Engines Using a Single Switch Box and Three Ignition Coils
No Fire At All:
  1. Disconnect the black/yellow kill wire AT THE PACK and retest. If the engine’s ignition fires now, the kill circuit has a fault-possibly the keyswitch, harness or shift switch.
  2. Disconnect the yellow wires from the stator to the rectifier and retest. If the engine fires, replace the rectifier.
  3. Check the cranking RPM. A cranking speed less than 250-RPM will not allow the system to fire properly.
  4. Check the stator resistance and DVA output as given below:
Motors with Black Stator
  Wire Read To Resistance DVA  
  Blue
Red		 Engine Ground
Engine Ground		 3250-3650
75-90		 180V or more
25V or more		  
Motors with Red Stator
  Wire Read To Resistance DVA  
  White/Green Green/White 500-700 180V or more  

continued next page....
Page 10 - Index - Page 12