irrattic tachometer on 1997 Mercury efi 150

[dennisg]

My tachometer frequently gives a false reading, usually higher than it should. I was told it might be due to the voltage regulators going bad. Can anyone offer any suggestions on this problem.

 

[PierBridge]

Re: irrattic tachometer on 1997 Mercury efi 150

Your going to want to have this checked out.<br /><br />If it is a rectifier going out that can cause problems. I would have static test of all ignition components done.<br /><br />I don't know much but I did sleep in a Holiday in last night.....Welcome to iboats someone smart will be along shortly to help in the mean time try the search button.....welcome to iboats.

 

[Clams Canino]

Re: irrattic tachometer on 1997 Mercury efi 150

Originally posted by ggoody:<br />I don't know much but I did sleep in a Holiday Inn last night

Holiday Inn *EXPRESS*.<br /><br />He's right... get this checked. Eliminate loose wires yourself if you wish.<br /><br />-W

 

[PierBridge]

Re: irrattic tachometer on 1997 Mercury efi 150

Welcome to iboats someone smart will be along shortly to help [/QB]

Told ya...thanks C.C...

 

[bbalcer]

Re: irrattic tachometer on 1997 Mercury efi 150

Hope the folks who originally replied to this will check. I have a similar problem on a 1996 Mariner 115. Usually the tach works fine with a WOT of 5200RPM. Occasionally the tach will run high with an idle of 1100RPM and a WOT of 6400RPM. Seeing as though I didn't become a hydrofoil or reach a low earth orbit I figured the tach had a bad indication. Would a "static test" be a simple test of the wires via checking for shorts and bad connections on the rectifier? I've seen a couple threads on this but one went by way of spun prop this one was closest to my situation. Any other suggestions?<br />Thanks.