Checking the stop circuit on an outboard motor.
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If you plan on troubleshooting an ignition problem when there is no spark in more than one cylinder then using the key switch elimination method is your best first step.
This test is performed at the motor and thereby eliminating an problem area in the wiring harness in between the control box and the engine as well as the ignition switch.
Outboard motors have started converting to ignition systems since the early 1970s and not until the late 70s did the need for a battery voltage to produce a spark become unneeded.
Even though some manufacturers have named them differently they are basically just an ignition system that are very strong without the need for points and a condensor.
The Wire colours and terminal location for 12 volt systems with a switch varied yearly and on each motor. If you are not sure which wire or terminal to check for the voltage, then you can contact a professional and ask. Just make sure you tell them the correct model and serial number.
You may find a wire colour and location chart on the internet by searching google.
The older Battery CD Systems need you to check that the terminal or wire at the Power Pack has a presence of battery voltage. This is most cases should be no less than 9-10 volts with the key in the on position. When cranking the 9-10 volts should also remain steady.
If this is the case then you know that your switch and wiring harness is no thte problem.