M-JET DIAGNOSTIC · YAMAHA

Checking Yamaha WaveRunner Battery Voltage and Charging System

Many problems on a WaveRunner originate in the voltage. A weak battery triggers fault messages that have nothing to do with the actual component. M-JET DIAGNOSTIC shows you battery voltage in real time.

How to check the voltage

  • At standstill with ignition on
  • During starting, watch how far it drops
  • With the engine running, at idle and under load
  • Check the fault memory for messages about battery voltage

What the values mean

A healthy battery at rest is in the range of about 12.5 volts and more. With the engine running, charging lifts the voltage. If it stays below, that can point to a problem with the generator or regulator. If it collapses to a very low level when starting, the battery or a contact at the terminal is weak. Voltage problems also cause false alarms from other sensors, so it always pays to look here first.

Related topics

Everything runs via app over Bluetooth, for Yamaha WaveRunners from model year 2002 to today. Learn more about the M-JET DIAGNOSTIC for Yamaha WaveRunner.

You also ride a Sea-Doo or Can-Am? The M-JET DIAGNOSTIC is available for BRP vehicles too.

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