alternator tacho's help required

[Jools_of_Top_Cat]

alternator tacho\'s help required

I have just bought 2 off aternator sense tacho's from ASAP supplies. I was assured that they would run off my Yanmar 1GM10 35 amp alternators.

Unfortunately there is no signal output from the alternator, so a quick search on the internet while onboard this weekend I found a pdf document relating to this problem. It said, I should take the signal from any of the stator side rectifying diodes, as a 3 pole alternator this seemed easy enough. I ended up soldering to many different places on the half moon diode assembly to no avail.

I have the circuit diagram for this assy, but not a schmeatic and as the didoes are all buried in epoxy I cannot tell which way round they are, to top matters off my multimeter has died (typical). There is a capacitor which I was told I would require, I did not receive destructions but I guess this should be in the signal line to eliminate any DC element.

Has anyone successfully linked alternator sensed tacho's to these alternators with success, can you help me to see what I am doing wrong.

The tacho also has two other connections, one to ground which I have strapped to the engine and the other to battery which I have connected to my 'white' ignition wire on the simple yanmar panel.

Any help will be appreciated.

<hr width=100% size=1><font color=blue> Julian </font color=blue>

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[CRM]

Re: alternator tacho\'s help required

That's par for the course for ASAP

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[steffen]

Re: alternator tacho\'s help required

What type of alternator do you have. My 3GM has a 35 amps Hitachi LR35 with a rev counter connected.
I can check the weekend how it is connected.

Happy sailing, Steffen

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[salamicollie]

Re: alternator tacho\'s help required

Suggest you talk to Brian Pumfrey at Dickies of Bangor, they do this mod to most of the small yanmars (well they did until a new Hitachi 55A was fitted last October)


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[Guest]

Re: alternator tacho\'s help required

I would be interested in the link to the pdf file.
Thanks
Neil

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[Jools_of_Top_Cat]

Re: alternator tacho\'s help required

this is the sheet I found, the pin outs on the tacho's I have seem identical, see page 3 for reference to no signal output on the alternators.

http://www.fwmurphy.com/Installation/SECTION 20/TAH-97029N.pdf

it wont auto link, sorry

I have hitachi 35 amp alternators, not sure of exact type. It looks like one of the connections I did try was correct, i.e. there are 3 stator wires linked to the diode assy, this as I presumed was the ends of the star arrangement. The fact this did not work at the weekend made me presume that my problem was connecting to the wrong place.

I now need to check if the other tacho works (not tried yet)
Or my +12v battery and GND connections are in fact correct.

Ho hum. hope this link helps out anyway.

<hr width=100% size=1><font color=blue> Julian </font color=blue>

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[stamfordian]

Re: alternator tacho\'s help required

I had problem with this, ASAP ,contry to others opinions sent me an e-mail ,with a diagram of how to wire up a tacho.You need to connect to a single phase ie to one coil.Give them a bell i think the guys name was ANdy but don,t quoete me!!!

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[steffen]

Re: alternator tacho\'s help required

Hi Julian,
Sorry for late reply. I have checked on my 3GM, but not much use to you. The tacho is wired to a transducer on the engine and thus gives no clue as to how to wire it to the alternator.
Sorry.

Happy sailing, Steffen

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