Yanmar RPM Gauge Issue

[toddedger]

Cheechako is right. Balmar will tell you your wired up correctly, but juice leaks inside the regulator turning the engine alternator off when it senses the higher voltage. You need to add a relay in the path so the voltage at startup is not coming from the engine battery. You could also use an oil pressure sender to turn on the regulator with house voltage. Balmar says the current can't leak through in there regulator, but i've seen it more than once on two different Balmar regulators. Disconnect that power wire off of the engine regulator and you will see the tach start working as well ass the engine alternator.

[sailorchic34]

Originally Posted by dtlx11

We have the same engine, the same display panel and the same problem.

Let me know if you get it fixed, my problem goes further in that nothing on my panel works apart from the starter button. No revs, no oil pressure alarm no temperature alarm and no water pressure.

I've checked all the connections and wires against the wiring diagram in the manual and it all looks good but nothing works.

Did you check the fuse on the wiring harnass located on the bell housing by the starter, White plastic thingy. A royal pain to replace as it takes two hands. to hold and close the fuse holder. I replaced mine and relocated it to a easier location to reach.

[rein]

On my h4je4 I have also a problem, with the rpm, only sometimes he starts to run as far as possible on the meter.. When I switch down the engine and restart again the measurement looks ok.

[dtlx11]

Originally Posted by sailorchic34

Did you check the fuse on the wiring harnass located on the bell housing by the starter, White plastic thingy. A royal pain to replace as it takes two hands. to hold and close the fuse holder. I replaced mine and relocated it to a easier location to reach.

I will certainly give that a try, I didn't know there was a fuse in there somewhere.

[MarkJ]

Originally Posted by theway

Here is my Gauge (it's not pretty).

Any thoughts?

Attachment 95271

Yes! This one is easy

Your tacho is in the open... Notice the moisture drops on it? And the rust mark below it?

My tacho started being intermittent, in the way you describe, during and after rain... When the weather dried out it was better. So I built a plastic cover for the instruments. Fine for a while but now its died completely.

Had the electrician here the other day and he stick his thinggy up the tachos butt and the Sender is sending, but the little guy inside has vacated.

So its a new tacho for me, and looks like a new one for you. Can we get a bulk order discount???


Lol

[S/V Antares]

The tacho is driven by the Magnetic pickup on the flywheel housing. It counts the flywheel teeth. 127 teeth per rev. You can use a voltmeter on AC and see if the sender is putting out. The senders have no moving parts and do not fail as a rule. Some of the newer Yanmars use a alternator AC tap to drive the tacho. f it is a bad tacho you will need to get one that will accommodate the high pulse rate. Most alternator driven tacho's are 6 or 12 poles and wil not work with the mag pickups.

[Sailorman Ed]

you will need to get one that will accommodate the high pulse rate.

Can we get a bulk order discount???

Looks like we need a source for these (other than Yanmar) Anyone got some sources?

[S/V Antares]

VDO makes a programmable Tacho with an LCD hour meter

Programmable Tachometers with LCD Hourmeter | Cockpit International | By Series | Instruments VDO Marine Gauges

[Boatyarddog]

Originally Posted by bill good

Very common problem. Pulse generator is from magnetic pickup on flywheel. 2 wires & the tacho needs a pos 12v & a earth back to the motor for the neg. Also the harness becomes brittle with age & heat. The two plugs & sockets are a source of intermittent problems.
Regards

That's what I've experienced with my 2gm20f Yanmar tach signal wires or sensor.


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