Tach Not Working

[200VEGAS]

Does It Get A Signal From Under Flywheel, And How Can You Check If Its Coming Out Of There. The Tack Signal Lead Wire Is Grey Going Into Harness Into Boat And Hits A Yellow W A Strip Coming Out Of Harness Coming From Under Flywheel Would I Need To Change Stator Or Rotor If No Signal?? 1982 2.0 Merc 150. Thnks

[rpm racing]

Most likely the rectifier is gone. It is a little black box with three terminal post on it.

The grey tach wire should be on one of the post.

It is a cheap part and merc used it on many of the motors.

[200VEGAS]

THE TACH WILL NOT WORK WITH THE GREY LEAD ON THE CENTER TERMINAL OF THE LITTLE SQAURE CUBE. GUESS THATS THE RECTIFIER. I GOT TO GET A SERVICE MANUAL. IS IT EASY TO CHRECK TIMING? I HAVE A AUTOMOTIVE TIMING LIGHT

[200VEGAS]

DID SEARCH FOUND SOMETHING FROM JAYTHNKS JAY,

[wrechin2]

Here are the pages ouit of the manual. Precedure han't changed. Just have different specs. Hope this helps.

[200VEGAS]

I Printed It Thanks Wrechin2

[wrechin2]

No problem. That 82 should not have any stabilizers. Just skip the oil system stuff. Just make sure to check the pointer with a dial indicator. No telling who has moved it. Hate to see you set it at what you think is 22* and it be 30*!!!!!! On the front of the air box it should have what to set the timing at.

[Reaction1]

I need a little help diagnosing a tach problem. How do you measure the signal coming out of regulator through the grey wire? Is it measured as voltage, amps or what? The starboard tach stopped working so I hooked up the grey wire from the port engine and it works. That eliminates the tach as the culprit. I've run diagnostic tests on the stator, trigger, and rev-limiter. All check out. So, it has to be either the regulator or the wring has a short somewhere. How do I check the signal from the regulator? This is on a V-6 Merc; the water-cooled type regulator.