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Old 08-08-2019, 06:17 PM   #1
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Alternator wiring

The PO had the alternator replaced, i saw old bills.


But it looks like he found a piss poor yard to fix it


you can see loose wires some out of the loom and a black wire that looks like it doesn't belong there


Also there's a part with several wires and some kinda copper wiring all exposed.


Can anyone shed some lite on the mess?
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Old 08-08-2019, 07:13 PM   #2
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That looks like an electromagnetic relay that is missing the case.

Could be an old school voltage regulator.
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Old 08-08-2019, 09:14 PM   #3
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When you figure out that mess it might be time to look at the thing behind the alternator. Looks like one bolt got dead shorted and half melted and the other is corroded. What is it?

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Old 08-08-2019, 09:50 PM   #4
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I think those are zincs?


I'll look closer tomorrow
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Old 08-08-2019, 11:30 PM   #5
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You need to trace the wires that go to the relay to see what it controls. It could be a relay that ties 2 battery banks together for charging when the engine is running.
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Old 08-09-2019, 12:36 AM   #6
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Looks like a "cube" relay with cover missing. It might be connected to an oil pressure switch to prevent field energization until after engine is running. Can't tell from pic where red wire goes or what other wires are on relay.
Does the alternator work as is? if so replace the relay with new, return the wires to inside the loom where they belong, and put a new boot over the alt output terminal (heavy gauge wire in the back).

That is a heat exchanger back there with corrosion on what looks like zincs and/or drain plugs.
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Old 08-09-2019, 06:02 PM   #7
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Question

Cleaned up all the sloppy wiring, then compared to other engine,
not so bad all wiring appears the same ie: correct


Just this relay the one had a cover


what does it do,



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Old 08-09-2019, 08:00 PM   #8
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It connects terminals 3 and 5 if there is power across terminals 1 and 2.

What are the terminals attached to? Where do those wires go?
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Old 08-09-2019, 08:07 PM   #9
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Also, it looks like it is rated to 12V/25A, which is 300W. So, it is /unlikely/ for what should be a major like battery charging, etc.
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Old 08-09-2019, 08:12 PM   #10
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If I recall they all go to the alternator.
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Old 08-09-2019, 08:13 PM   #11
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Engine stop solenoid relay?
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Old 08-09-2019, 08:41 PM   #12
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Lipets,

Without knowing where the wires go, we can only guess. Next time you are at the boat and have time follow as many of them as you can. With more info we can help more definitively (or you may find the answer at the end of one of the wires). But, that is basically a general purpose low wattage 12v relay, so could be used for many things. It isnt a specialized part.
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Old 08-09-2019, 08:43 PM   #13
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Also, there is not normally a relay for the tach.
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Old 08-09-2019, 09:23 PM   #14
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I'll be on the boat tomorrow and see where each go.


I saw something similar called it an electromagnetic starter relay????
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Old 08-09-2019, 09:31 PM   #15
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That is the right type and spec for a starter relay on many boats -- but it could be many things. See where the wires lead.

If it is a starter relay what it does is allow long, cheap, low current wires running to the ignition switch to control the solenoid that operates the starter. The solenoid requires more juice than the relay and so would require thicker wires to the ignition switch(es) at the helm(s).
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Old 08-09-2019, 11:12 PM   #16
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Wires connected to lugs 3 and 5 are being switched off and on, on when relay is energized, so some device is being disconnected and reconnected, a relay is an automatic switch.

I dont like the missing cover, and it already looks rusty. If its just a standard 40 amp cube relay, they use the same for automotive, will be easy to get and fairly cheap too. Bigger cube relays exist, I have two 70 amp rated. The rating may be printed on the cover. Bigger amp relays will have bigger lugs on 3 and 5, not 1 and 2 which are the coil wires that create the magnetic field that pulls the relay closed. For standard 40 amp rated relay, all lugs are same sizes.

Most likely its a NO relay just like automotive.
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Old 08-09-2019, 11:14 PM   #17
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sdowney,

Oops. You are right. I got the switch and load pairs backward!

-Greg
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Old 08-10-2019, 01:59 AM   #18
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Well I found a new replacement in the UK on Ebay $22


made in France!!!!!


Until it gets here I'll tape something over it so it doesn't short out.


But the mystery remains what it exactly does??
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Old 08-10-2019, 02:06 AM   #19
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[But the mystery remains what it exactly does

Well, one option would be to disconnect it and see what doesn`t work..........or is that a bit non tech?






QUOTE=lipets;790360]Well I found a new replacement in the UK on Ebay $22


made in France!!!!!


Until it gets here I'll tape something over it so it doesn't short out.


But the mystery remains what it exactly does??[/QUOTE]
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Old 08-10-2019, 02:08 AM   #20
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No need to wait for France. It is a common type of relay. You can bring it into any auto parts store and they can give you an equivalent one off of the shelf. What they sell you might look cosmetically different, but will work just the same, have at least as good electrical ratings, and the same size connections.
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