Tachometer not workin on 3.0L Mercruiser. Where to begin?

[jpdragon]

I have a 3.0L Mercruiser (Maxum 1998 1700SR). Bought last week and the tach is not working.

Where should I begin troubleshooting?

I had already repair the Speedometer gauge. I have a bad trim sender. Can the trim sender be repair or must be replace?

 

[Alpheus]

Re: Tachometer not workin on 3.0L Mercruiser. Where to begin?

Here is a link to the manual you need. Wiring diagrams are in there.

Follow the gray wire from your distributer...

http://www.4shared.com/document/Q2Xx_0in/Mercruiser_Service_Manual_26_G.htm

 

[tschmidty]

Re: Tachometer not workin on 3.0L Mercruiser. Where to begin?

Also check for ground connection on the back of the tach. You can try cleaning the trim sender but a lot of times it needs to be replaced which is not as easy as you would think.

 

[jpdragon]

Re: Tachometer not workin on 3.0L Mercruiser. Where to begin?

If I put the volt meter on the tachometer cable. Should I get any voltage reading from those cable? "Purple" / "Purple" / "Black"?

 

[Alpheus]

Re: Tachometer not workin on 3.0L Mercruiser. Where to begin?

Did you read the manual I provided?

You should have 12 volts from purple to black. Their should be a gray signal wire back there also. If not that most likely is your problem...

 

[imported_TheMan]

Re: Tachometer not workin on 3.0L Mercruiser. Where to begin?

If it used to work and it no longer does, the tach has probably bad. I've got to replace one myself...