93 Johnson 88 SPL

[motorvator]

The tachometer on my boat has started to read incorrectly. Sometimes it reads higher than what the motor is turning, like at idle. Is there a way to determine if its the tach or the rectifier?<br />Motor starts and runs fine, top speed is 41MPH which it has been since new.<br />Phil

 

[motorvator]

Re: 93 Johnson 88 SPL

Any ideas?

 

[motorvator]

Re: 93 Johnson 88 SPL

Anyone know if this test will work on my 88SPL?<br /><br />The gray lead of the engine wiring harness is connected to the gray lead of the regulator/rectifier. Move that wiring harness gray lead so that it connects to one of the yellow leads of the stator. You may need to try both yellow leads.<br /><br />If the tachometer operates as it should with the gray lead connected to one of the yellow stator leads, the water cooled regulator/rectifier is failing and requires replacing.<br /><br />And of course, if the tach still reads weird, the tach is faulty.