This 45 hp Mercury lost spark on all four cylinders. The owner wants it fixed and asked me to diagnose the problem and fix it. Is the Stator, Trigger, Switch Box or Coils?
This video is how I diagnose which component(s) failed to determine what it needs to get it running again using just a volt/ohm meter and a Direct Voltage Adaptor (DVA) . The ohm meter is used to measure resistance for the Stator and Trigger then finally using the DVA adapter being plugged into the Volt Meter measures peak voltage. This is needed because the volt meter by itself measures only average voltage, whereas the DVA is needed to measure peak voltage outputs.
Off camera I also made sure to check the kill circuit first as well as the tilt / cut off switch. Both circuits were working fine so that left the coils but since it was sparking on all four cylinders just minutes before it stopped running it made sense that all four coils wouldn’t fail simultaneously. So the problem had to be either the Stator, trigger or switch box. I started with the Resistance of the Stator, then the Trigger and finally the checking the voltage outputs of the Switch Box using the DVA and Volt meter. All outputs were compared to the specifications outlined by CDI technical sheets on their webpage www.cdielectronics.com go to the Technical Support tab then click on Technical Support Documents then DVA charts for all resistances and peak voltage requirements specific for your motor.
Part 2 - “New Switchbox Regained Spark Now Overheating - Find out Why”:
• New Switchbox Regained...
Part 3 - Carb Clean & Install
• 1989 45 hp Mercury - C...
Part 4 - Still to Hot
• Steaming Hot Telltale ...
Part 5 - Overheating? Try This!
• 1989 45 hp Mercury - O...
Part 6- Overheating - Found the Problem & Resulting Carnage.
• 1989 45 hp Mercury - O...
30 сен 2024
