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Bad Tach or Regulator?

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Jack K

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Oct 4, 2001
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I have a 96 170dc w/merc 90. Dunno if I have a bad tach or V regulator. The Tach does move when on the go but only registers to 2000rpm at full throttle.



Is there a way to trouble shoot this problem?



Any info is greatly appreciated.



Thanks in advance!
 

Russ Charles

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Jun 1, 2001
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Not sure about the 90, but on the larger motors there 2 regulators, each one having a tach output. Just switch the tach wire to the other one.



Russ
 

Rob LaMoy

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Mar 19, 2001
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I agree with Bob. I had the same problem with my outboard and it turned out to be the regulator. Marine tachs do fail more often then auto, but I would bet it is the regulator by what you are telling us. Good luck. Hope your's is cheaper than mine was.

Rob
 
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