Tacho problems omc 4.3 1992

[surfing trevone]

I have recently has my local RNLI electrician rewire the dash on my omc 4.3 1992 but we are having lots of problems with the tacho.
Should it be wired through the esa (if it is then it seems to jump around a lot)
Or
Should it be wired direct to the negative of the distributer (this does not seem right either)
Or
should it be wire to the alternator

The ESA is new.

I have had a conversion done recently from cobra leg to mercruiser alpha 1 gen two leg. Within thsi conversion it says some thing about by passing the esa but i dont beleive this has been done as the interuopter switch still works.

PLEASE HELP summer is glorious this year and we are set with problems so boat is layed on its mooring.

 

[Levinz11]

Re: Tacho problems omc 4.3 1992

The tach is wired to the negative terminal on the COIL.

 

[Howard Sterndrive]

Re: Tacho problems omc 4.3 1992

I don't know what RNLI is, but tachometer wire goes to coil negative (-) post.

 

[surfing trevone]

Re: Tacho problems omc 4.3 1992

I don't know what RNLI is, but tachometer wire goes to coil negative (-) post.

ROYAL NATIONAL LIFE BOAT INSTITUTION (RNLI)

We beleive it is the coil that is at fault so this is now going to be replaced!