1993 Mariner Tach problem

[jatwigg]

I have a 1993 Mariner 25hp outboard and the tach works for a minute or so when i start the boat then dies. I have checked the rectifier with the leads disconnected and it tests good. The tach works fine in another application so I know its not the instrument. Has anyone ever run across a rectifier that tests good without power and when applied power will fail? I am trying to get a handle on this and can't. It appears the battery is not charging also. The stator tests good with a multimeter so I know its not that.Would a bad battery cause this? If anyone has any ideas I would be grateful.

 

[Barnacle_Bill]

Re: 1993 Mariner Tach problem

If the stator tests good and its not charging then most likely the rectifier is failing.

 

[jatwigg]

Re: 1993 Mariner Tach problem

Thats kinda what I thought. The only thing that was throwing me was the fact that the rectifier bench tested fine. I think I'll get a new one and see if thats it.

Thanks for the reply

 

[Dave1027]

Re: 1993 Mariner Tach problem

Can't he disconnect the rectifier and run the tach straight off the stator to make sure it's not the stator?