1/2/Both switch is AFD wired, but to where? - SailNet Community

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Old 09-04-2013
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1/2/Both switch is AFD wired, but to where?

The alternator on my Yanmar 3GM30F is an Hitachi LR155-20 which is internally regulated. My Guest 1/2/Both switch has two small-ish posts marked field disconnect, with wires attached. Any idea where these might be going? The alternator looks to be wired as expected: E, BAT, and two smaller wires going to the instr panel. No sign of any field disconnect wires at or near the alternator.

Thanks much!
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Old 09-04-2013
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Re: 1/2/Both switch is AFD wired, but to where?

See this link Alternator Field Disconnect - Blue Sea Systems for a good explaination
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Re: 1/2/Both switch is AFD wired, but to where?

Perhaps they are using the AFD to break another load or your alt has been wired for external regulation and the wires run to an ext regulator.... AFD only works if you have access to the regulator field wire or the regulators B+ / excite wire..

The AFD works by disconnecting the alt field microseconds before you dump the load. It is designed to protect the alternator diodes from a load dump. There are better ways to prevent fried diodes but this is one of them..
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Re: 1/2/Both switch is AFD wired, but to where?

Thanks zephr and MainSail.

I've seen the BlueSea AFD primer, no joy there. As MainSail pointed out, my alternator is internally regulated. Checking my Yanmar shop manual wiring info AND visually inspecting the back of the alternator confirms internal regulation.

Alternator wiring.
BAT post is wired to the starter + post.
E post is wired to ships ground.
Below BAT post are the L and R which run to the engine instr panel.

No Field wires to be seen anywhere.

But there is an unconnected set of wires run for a never installed battery charger. Heavy gauge red (2) and black(1). I think I also saw two unconnected light gauge wires... would the AFD wiring on the battery switch ever be connected to an AC battery charger?

Last edited by WoobaGooba; 09-04-2013 at 09:40 AM. Reason: Pic URL
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Re: 1/2/Both switch is AFD wired, but to where?

Quote:
Originally Posted by WoobaGooba View Post
Thanks zephr and MainSail.

I've seen the BlueSea AFD primer, no joy there. As MainSail pointed out, my alternator is internally regulated. Checking my Yanmar shop manual wiring info AND visually inspecting the back of the alternator confirms internal regulation.

Here is a pic of the back of the alternator ...



BAT post on the left, which is wired to the starter + post.
E post on the right, wired to ships ground (smaller wire to instr panel -)
Below BAT post are the L and R which run to the engine instr panel.

No Field wires to be seen anywhere.
You'll want to trace them back and find out where they go... You never know what you'll find on boats so best to map out your system so you know and understand it....
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Re: 1/2/Both switch is AFD wired, but to where?

Yes, agreed. Time to trace these wires and map out the rest of the electrical system. Thanks
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Old 09-30-2013
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Re: 1/2/Both switch is AFD wired, but to where?

Answer is ... nowhere! Boat's manual does not match actual 12BO switch wiring (nothing attached to the AFD terminals).
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Re: 1/2/Both switch is AFD wired, but to where?

You might want to try doing a continuity test between the excite (red/black) wire at the back of the alternator and the two wires connected to the field disconnect at the switch. It's entirely possible that someone re-routed the wire from the oil pressure switch through the field disconnect before taking it to the internal regulator's excitation circuit.
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