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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Cooling problem solved now what's wrong with my tach?
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Thread: Cooling problem solved now what's wrong with my tach? Reply to Thread
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Topic Review (Newest First)
02-21-2014 07:06 PM
hellosailor
Re: Cooling problem solved now what's wrong with my tach?

If you have a "one wire" alternator, where the sense lead is tied back to the output (usually at the starter lead) then you may also have to blip the engine to get the alternator to turn on, and the tach won't read until then. Blip can mean 2x-3x cruising speed for 5-10 seconds.
02-21-2014 06:11 PM
H2814D
Re: Cooling problem solved now what's wrong with my tach?

Could you possibly reverse the original fix (replaced sender, etc.) and see if the tach problem still exists? If not, your answer could be in the incompatible or defective replacement parts.
02-04-2014 10:05 AM
tspooner
Re: Cooling problem solved now what's wrong with my tach?

Quote:
Originally Posted by Faster View Post
T... Don't think you ever confirmed whether or not you were actually charging?
No, that was one step I missed due to a misplaced multimeter which I have now replaced with a new one. I'll be back up there for the Saturday race (brrr) and will check that out as well though there seems to be plenty of battery for starting the engine.
02-03-2014 02:04 PM
MarkSF
Re: Cooling problem solved now what's wrong with my tach?

The boat was wired with excite via the ignition key. So yes, I just disconnected the excite. Some alternator expert told me that disconnecting the excite while an alternator is putting out a good output is not good practice. Most of the time, it might be OK, but occasionally, not so. I think generally most of us avoid bad practice on principle.
02-03-2014 01:57 PM
Maine Sail
Re: Cooling problem solved now what's wrong with my tach?

Quote:
Originally Posted by MarkSF View Post
My boat came with a blown alternator, and then I blew the diodes on the replacement by turning off at the key before stopping the engine. In both cases, the tachometer would not work. As Faster says, you really need to check that you have a healthy charging voltage - 14V or more.

If not, either the alternator is faulty, or it is not getting the excite voltage via the ignition switch.

Mark,

I would love to know exactly how that alternator was wired so that turning off the key disconnected it from the load? Turning off the key has zero effect on most alternators. The only time it would, could be if a PO improperly wired something... Most factory alts are either key on excite or self sensed. With key on excite turning the ignition key off just turns off the regulator and the alt shuts down. With self sense excite it keeps on working even with the key off and unless the key also turned off the battery switch or other funky home brew configuration then the alts keeps running.
02-03-2014 01:39 PM
MarkSF
Re: Cooling problem solved now what's wrong with my tach?

My boat came with a blown alternator, and then I blew the diodes on the replacement by turning off at the key before stopping the engine. In both cases, the tachometer would not work. As Faster says, you really need to check that you have a healthy charging voltage - 14V or more.

If not, either the alternator is faulty, or it is not getting the excite voltage via the ignition switch.
02-03-2014 11:59 AM
Faster
Re: Cooling problem solved now what's wrong with my tach?

T... Don't think you ever confirmed whether or not you were actually charging?
02-03-2014 10:36 AM
tspooner
Re: Cooling problem solved now what's wrong with my tach?

Unfortunately my checks and actions over the weekend didn't produce any positive results. My "extra" loose wire is the original temperature wire from the old sending unit. It wouldn't reach the oil pressure unit or the alternator and reattaching it to the new unit didn't change a thing. All the wires on the alternator are protected by a boot and all were intact. Nothing appeared amiss at the bellhousing/clutch neither so I'm back to square one. I'll recheck the wiring at the tach itself behind the ignition/start plate next time out although it all seemed fine when I first looked.
02-02-2014 11:57 PM
alctel
Re: Cooling problem solved now what's wrong with my tach?

Yup, my tach isn't working on my Yanmar either so it'd be good to see what you did.
01-31-2014 12:29 PM
chucklesR
Re: Cooling problem solved now what's wrong with my tach?

T,

Can you come back and post the results when done, this would be of great help to others with similar issues.
I'm pretty sure it's just a loose wire
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