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#11808300 - 09/01/16 04:26 PM Help trouble shooting Merc Tachometer
tdavis184 Offline
Outdoorsman

Registered: 09/12/06
Posts: 129
Loc: Longview, Tx
1995 Mercury XRi 2.5 Liter 200hp..........Crank engine and tach appears very low in the 300 range. As RPM's rise so does the tach til at about half trottle (just on plane good) the Tach has pegged out at 9000. My plan is to clean connections on rear of Tach and inspect wires for obvious issues. Can anyone tell me how to test grey wire for correct voltage or Resistance? Two new rectifiers/regulators put on last summer. System is charging batteries correctly.
Thanks

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#11808308 - 09/01/16 04:32 PM Re: Help trouble shooting Merc Tachometer [Re: tdavis184]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11095
Loc: Littlefield Tx & Lake A. H. US...
You need to reset the poles on the tach.
The black rotating switch. Many times all one has to do is turn right, then back, then turn left, then back to get connection again.
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�The world will not be destroyed by those who do evil, but by those who watch them without doing anything� Remember what He has done and remember that He is not done yet! GOD IS GOOD

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#11808341 - 09/01/16 04:51 PM Re: Help trouble shooting Merc Tachometer [Re: tdavis184]
tdavis184 Offline
Outdoorsman

Registered: 09/12/06
Posts: 129
Loc: Longview, Tx
Thanks Gary..I will try that. I never run boat WOT. Actually very conservative. But I cant stand to have something that is not in correct working order.

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#11809076 - 09/02/16 08:36 AM Re: Help trouble shooting Merc Tachometer [Re: tdavis184]
Muzzlebrake Online   content
Extreme Angler

Registered: 12/26/14
Posts: 1439
Loc: Euless
FYI, a rectifier going bad or already bad will cause the tach to go crazy or not work at all. Take a look at the rectifier to see if its ever over heated. You will see black tar like stuff running down the outside and maybe some overheated wires that connect to it.
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