Tach question ??

[Cornbread9]

The motor is a 87 Yamaha 50hp pro G. The tachometer is zero when the motor is off and when you turn the key and start the motor the tachometer pegs to the right. The motor is running fine though. It isn't revving up with the tachometer. The tachometer is just 0 or pegged to the right. What do you think is causing this? Thanks.

 

[99yam40]

Re: Tach question ??

see if this info will help you
http://faria-instruments.com/site_manuals/IS0100_Tachometers.pdf


May just need to move the setting switches back and forth some to clean connections

 

[BaileysBoat]

Re: Tach question ??

see if this info will help you
http://faria-instruments.com/site_manuals/IS0100_Tachometers.pdf


May just need to move the setting switches back and forth some to clean connections

Ditto. Electrical contact cleaner worked for me.

 

[Bullrider]

Re: Tach question ??

Awesome info!!
Thank you!!

 

[Cornbread9]

Re: Tach question ??

I will clean connections this weekend and let you know. Thanks for your input

 

[Cornbread9]

So I cleaned connections and it still did the same thing. They were glazed for sure though. I then unplugged tach and started up. Also unplugged while running. Not sure which one fixed it, but it started working again and has been for a couple trips.

 

[gm280]

So I cleaned connections and it still did the same thing. They were glazed for sure though. I then unplugged tach and started up. Also unplugged while running. Not sure which one fixed it, but it started working again and has been for a couple trips.

Well when you unplugged the connection and plugged them in again, you actually help clean the contact in those two connector parts. You could also use the electrical cleaner on them as well... So you had corrosion and didn't actually know it. Corrosion with connectors doesn't have to be white powdery stuff or green crud either. It can be normal oxidation of the metal and look innocent. So remember that for future issues because you will have them...