Is the Mercury tach bad, or stator?

Re: Mercury Tach Problems – is rectifier bad, or stator?? Your wiring appears to be correct. The tach runs off an AC signal from the stator. The rectifier is a convenient tie in place for the gray wire as the stator also feeds it. Thats why when the rectifier goes bad it affects the tach. Test the stator according to your manual.

Why does the tach not read when the engine is running?

If the rectifier fails, it will usually cause the tach to not read. That is because the signal is generally shorted to ground. There is a test for the rectifier in the FAQ on this site. If it checks out good, and your battery voltage goes up when the engine is running, the tach is bad.

When does a boat run fine then loses power?

Last year at the end of the season the boat started running bad after running it for about 30 min. I could shut the boat off and let it sit for 5 min and it would run again fine for about 5 min. then it would lose power again and would backfire when I tried opening the throttle.

Why does my boat speed go up and down?

Another possible cause is an air leak in the fuel line. When this occurs, there’s a constant fluctuation in the amount of fuel that’s pumped to the boat’s carburetors, and as a result, the motor’s RPMs go up and down. Regardless of your boat’s throttle setting, the presence of an air leak will greatly…

Why is my boat running slow at full throttle?

Even if your boat is operational, riding with a spun blade places the propeller at risk for damage. Depending on the severity of the problem, it could leave your boat dead in the water unless the problem is fixed ASAP. Have you checked your propeller for debris?

How can I tell if my boat is losing power?

The other thing is ignition output which again can be checked by pulling plugs but you need to run the engine for a while in the “lossing power condition” then shutting the engine down as soon as you can and pull some plugs to see what color they are.

Is the Mercury tach bad, or stator?