If by grounding out the black-yellow wire on each power pack at the same time and the motor continued to run, then one or both of the packs are faulty internally and would have to be replaced. There are isolation diodes inside the packs to keep one "kill wire" from affecting the other pack so if one or both packs have open diodes, then the motor will not shut off if it continues to run on the other 2 cylinders.
If you are only grounding one powerpack, the engine may continue to on the 2 cylinders that are operating on the opposite pack. Both packs have to be grounded at the black-yellow wire for the motor to quit.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
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The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.
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