another mercury tach question...

[dfrants]

my boat has a matching set of OMC gauges, for years i had a 1991 90hp Merc 2 stroke and everything worked fine. last week i upgraded to a 1999 125hp Merc 2 stroke and now the tach is not working right. sometimes not at all. does this newer motor require a different tach?

 

[dfrants]

Re: another mercury tach question...

tach not working now. tried a Quicksilver tach...no reading. my 90hp had a recticfier that i replaced to get the tach to work, can't find one on my 125hp.

 

[carholme]

Re: another mercury tach question...

The 125 should have a Voltage Regulator with the rectifier combined whereas your 90 had a separate rectifier

Do you have the s/n of your engine as I have the service manual and can send you a copy.

Gerry

 

[dfrants]

Re: another mercury tach question...

yes its 0G911197. also does this motor have a rev limiter?

 

[achris]

Re: another mercury tach question...

my boat has a matching set of OMC gauges, for years i had a 1991 90hp Merc 2 stroke and everything worked fine. last week i upgraded to a 1999 125hp Merc 2 stroke and now the tach is not working right. sometimes not at all. does this newer motor require a different tach?

You'll find 2 yellow wires coming down from the stator (under the flywheel) that go into the regulator. If you have the gray tacho wire plugged into the gray wire on the regulator, try removing it and plugging it into one of the yellow wires... Should work then... (BTW, needs to be plugged with one of the yellows, not instead of. ie, spliced into.)

yes its 0G911197. also does this motor have a rev limiter?

Yes.

 

[carholme]

Re: another mercury tach question...

That s/n comes up as:

MERCURY - (125 H.P. (1999 ))
Serial No: 0G911197 Model No: 1125412VD

Parts and Service Bulletin List for s/n 0G911197:

Search Results - Crowley Marine

If you PM me with an email address, I will send you a copy of the manual.

Gerry

 

[dfrants]

Re: another mercury tach question...

...and its ok to run the motor with these wires crossed? wow.

 

[achris]

Re: another mercury tach question...

You're now crossing wires. All you're doing is disconnecting the gray wire and connecting it to one of the yellow wires...

 

[carholme]

Re: another mercury tach question...

Don;

I am trying to send you the manual but this is what I get back:

The user(s) account is temporarily over quota.

Gerry

 

[dfrants]

Re: another mercury tach question...

that file must be too big, my mail box is empty. thank you for trying Gerry.
Don

 

[carholme]

Re: another mercury tach question...

Don;

The file is only 14.5mb. I will try again this morning and if necessary, will split it into two emails.

Gerry

 

[dfrants]

Re: another mercury tach question...

it worked...i got them...thanks again Gerry.