Look at trigger as 1 and 4 are the same coil, ohm test it....
No fire or Intermittent on One or More Cylinders:
?Note: If two cylinders on separate packs are not firing, check the trigger as described in # 1 below. The trigger has three coils firing six cylinders. #1 and 4 share a trigger coil, 2 and 5 share a trigger coil and 3 and 6 share a trigger coil.
1.Connect a spark gap tester and verify which cylinders are acting up. If the cylinders are only acting up above an idle, connect an inductive RPM meter to all cylinders and try to isolate the problem cylinders.
2.Check the trigger resistance and DVA output as given below:
Wire (yellow sleeve) Read To (black sleeve)..... Resistance............. DVA (connected)
Brown wire)...........................Purple wire............800-1400.....................4V or more
Purple wire..........................White wire..............800-1400.....................4V or more
White wire.............................Brown wire........... 800-1400.....................4V or more
?Note: You should get a high or open resistance reading to engine ground from each wire, but you will get a DVA reading of approximately 1-2 Volts. This reading can be used to determine if a pack has a problem in the triggering circuit. For instance, if you have no fire on one cylinder and the DVA trigger reading for that cylinder is low ? disconnect the trigger wire and recheck the DVA out put to ground from the trigger wire. If the reading stays low ? the trigger is bad.
3.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.
