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Page 19 - Index - Page 21
Mercury Alternator Driven Ignition Systems
Two Cylinder Engines
  • NOTE: These engines sometimes develop a problem where you only have one cylinder firing. This can be caused by the flywheel magnets coming loose and shifting around until they touch. If only one cylinder is firing, remove the flywheel and check the magnets to see if they are tightly bonded.
1979-1997 models
(With 332-7452 Switch Box)


No Fire At All:
  1. Disconnect the Black/Yellow kill wire and retest. If the ignition system now fires, the kill circuit has a problem.
  2. Check the stator resistance and DVA output:
  Wire Read To Resistance DVA  
  Black/Yellow
Black/White
Engine GND
Engine GND
3250-3650
200-250
180V or more
25V or more
 
  1. Check the trigger resistance and output:
  Wire Read To Resistance DVA  
  Brown/Yellow
Brown/Yellow
Brown/White
Brown/White
Engine GND
Engine GND
750-1400
Open
Open
4V or more
1V or more
1V or more
 
No Fire on One Cylinder:
  1. Check the DVA output on the green wires from the switch box while connected to the ignition coils. Check the reading on the switch box terminal AND on the ignition coil terminal. You should have a reading of at least 150V or more at both places. If the reading is low on one cylinder, disconnect the green wire from the ignition coil for that cylinder and reconnect it to a load resistor. Retest. If the reading is now good, the ignition coil is likely bad. A continued low reading indicates a bad power pack.

1994-1998 models
(With the 18495 Switch Box)


No Fire At All:
  1. Disconnect the Black/Yellow kill wire and retest. If the ignition system now fires, the kill circuit has a problem.
  2. Check the stator resistance and DVA output:
  Wire Read To Resistance DVA  
  Blue
Red
Black
Black
3250-3650
200-250
180V or more
25V or more
 
  • NOTE: This system uses a timing advance circuit inside the switch box to control timing. The black stator wire is NOT tied directly to ground inside the pack.
  1. Check the trigger resistance and output:
  Wire Read To Resistance DVA  
  Brown/Yellow
Brown/Yellow
Brown/White
Brown/White
Engine GND
Engine GND
750-1400
Open
Open
4V or more
1V or more
1V or more
 
No Fire on One Cylinder:
  • Check the DVA output on the green wires from the switch box while connected to the ignition coils. Check the reading on the switch box terminal AND on the ignition coil terminal. You should have a reading of at least 150V or more at both places. If the reading is low on one cylinder, disconnect the green wire from the ignition coil for that cylinder and reconnect it to a load resistor. Retest. If the reading is now good, the ignition coil is likely bad. A continued low reading indicates a bad power pack.
Page 19 - Index - Page 21