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Author Topic:   Testing Evinrude Stators and Voltage Regulators
mrburns posted 09-07-2009 12:26 PM ET (US)   Profile for mrburns   Send Email to mrburns  
[Seeks advice on procedures to test the stator and voltage regulator of an 1980 OMC 85-HP motor which he believes are now damaged after he jump-started the engine from another battery. Later he then disconnected the boat battery negative while the engine was running above idle speed. He also worries that the battery he is using, which is not identified, may be the wrong type.]
jimh posted 09-07-2009 01:26 PM ET (US)     Profile for jimh  Send Email to jimh     
Attaching an external battery in parallel to boost a dead battery for engine starting can often create voltage transients which can damage electronic components. I recommend it only in an emergency situation.

Disconnecting the battery from the engine while the engine is running is almost certain to cause damage, just as you report. There are explicit warnings against doing this in the Evinrude literature. It is not surprising that you have caused damage to electrical components by disconnecting the battery.

In the factory service manual there is a procedure for testing the stator and the regulator. It requires some electrical test equipment and some familiarity with electrical devices. If you want to continue to perform service on your motor, buying the factory service manual is a good investment.

To establish if your battery is the wrong type, you will first have to tell us what type of battery you have.

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