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Old 25-02-2012, 12:03   #1
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Alternator Light and Buzzer as Isolation Diode

Hello
i have an alternotor hitachi (see picture) atahed on a yanmar 2GM20
I want to remouve the isolation diode uded to charge two batery (as i don't have a seconde batery)
Isolation diode one entry "alternoator" and Two output "bat1 and bat2"

the probleme is
when i remouve the isolation diode, the charging light and buzer goes on (the key if off)

evrething runing ok, with the isolation diode
not light
put the key on
light and buzer on
start motor
light and buzer off


with the isolation diode
light and buzer on with key off

any help
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Old 25-02-2012, 15:13   #2
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Re: Alternator light and buzer ans isolation diode

madiera, that looks like a conventional alternator which normally has only one charging output. You don't say, but I am rashly assuming, that this one battery output from the alternator goes to an isolation diode "box", a device that has one input and two outputs.

If that is correct, you should be able to simply remove the diode box, connect the alternator's battery output to the one battery you have, AND also connect the alternator's "voltage sense" lead to the same battery's positive terminal. I don't see a "voltage sense" lead marked on the alternator photograph, but there usually is one. I expect that whatever is being used as the alternator sense lead is being disrupted when you remove the diode box, and that is why the system is (rightfully) complaining.
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Old 25-02-2012, 18:52   #3
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Re: Alternator light and buzer ans isolation diode

thank you for your answer

i think you are correct
I will try to see where i can find the voltage sens and put it directly to the positif

i have to "dig" more

philippe
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Old 25-02-2012, 19:04   #4
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Re: Alternator light and buzer ans isolation diode

I'm not sure which wire your taking about but I don't see any dual battery outlet in its schematic.

.
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Old 26-02-2012, 06:02   #5
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Re: Alternator light and buzer ans isolation diode

by looking at the alternator, the wire that is on the "static 1.5, full voltage when charging" i think you'll see it becomes energized when the ignition switch is turned on, and that's your sensor wire.
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Old 26-02-2012, 06:33   #6
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Re: Alternator light and buzer ans isolation diode

That's correct, the wire labeled "static" is the voltage sensing wire. Under the gray paint it should be red with a black stripe. It comes from the ignition switch and is tied into the "hot" side of the charge and oil pressure warning lamps as well.

Not sure how it would help to remove it from ignition switch and put straight to battery positive. Same difference when the ignition switch is on.

In the second picture, the only thing not original is the wire with the splice connection coming off the alternator output. Where does that go?
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Old 26-02-2012, 07:26   #7
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Re: Alternator light and buzer ans isolation diode

if the boat had an isolator in it then someone put that wire on the battery side of one of the isolator posts. trace that wire from the ignition switch had make sure it goes directly to the alternator. or run a new wire. i wouldn't make that wire hot all the time from the battery.it needs to be turned off when the alternator isn't working.
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Old 26-02-2012, 11:27   #8
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Re: Alternator light and buzer ans isolation diode

hello
thank you all
i have disconected all the cable that was not original

"the only thing not original is the wire with the splice connection coming off the alternator output. Where does that go?"
still don't know where does it goes but it is disconeted now

and they was also another cable going into the input of the isolator

I have remouved this two cable , now everything runing as it should

thank you verry muh
best forum ever

philippe
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Old 26-02-2012, 16:04   #9
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Re: Alternator light and buzer ans isolation diode

Very good!
Now with those two wires removed, you may find something else that doesn't work. But now they can be wired up properly.
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