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Old 20-11-2013, 08:37   #1
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Wiring Diagram for Mitsubitshi S3L2 engine

I have been looking for a wiring diagram for a Mitsubishi S3L2 engine I bought in a moment of need and now needs repair.

I have tried contacting Mitsubishi and they don't seem to understand what I want, or don't want to.

Any suggestions would be appreciated.

Calusa Sailor
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Old 20-11-2013, 10:11   #2
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There shouldn't bee too much to the diagram to begin with. What do you need?
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Old 20-11-2013, 10:46   #3
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

I have a mess of wires going to 2 relays along with 2 hots coming off the solenoid.

I do not want to just dump the relays and wire it direct, not knowing what they had in mind with the relays.

thanks for your reply.

calusa sailor
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Old 20-11-2013, 10:51   #4
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

Quote:
Originally Posted by Calusa Sailor View Post
I have been looking for a wiring diagram for a Mitsubishi S3L2 engine I bought in a moment of need and now needs repair.

I have tried contacting Mitsubishi and they don't seem to understand what I want, or don't want to.

Any suggestions would be appreciated.

Calusa Sailor
Mitsubishi is not much of a help. What is the engine HP? I ask because it may the same block as in my Westerbeke 30B3 and if so I have one. I also have a source for the Mitsubishi manuals.
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Old 20-11-2013, 10:57   #5
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

It is a 28 hp. It started life as a generator motor off a large motor yacht that went bad, so the owner just replaced the whole thing. I bought the motor and dumped the generator.

Hope you can help.

Calusa Sailor
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Old 20-11-2013, 10:59   #6
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It'll probably be wired by whomever made the generator, not Mitsubishi. Mitsubishi has no control over the control circuitry built by the end user.
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Old 20-11-2013, 11:01   #7
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

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Originally Posted by Calusa Sailor View Post
It is a 28 hp. It started life as a generator motor off a large motor yacht that went bad, so the owner just replaced the whole thing. I bought the motor and dumped the generator.

Hope you can help.

Calusa Sailor
PM sent.
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Old 20-11-2013, 11:04   #8
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

Thanks, I guess the relays and extra wiring had to do with the generator and sensors. I am going to wire it myself.

Thanks for your help.
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Old 20-11-2013, 11:08   #9
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

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Originally Posted by Calusa Sailor View Post
Thanks, I guess the relays and extra wiring had to do with the generator and sensors. I am going to wire it myself.

Thanks for your help.
more likely one for the glow plugs,and one for the fuel solenoid emergency cut off from temp sensor and oil pressure senders.

was it a vetus generator?
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Old 20-11-2013, 11:17   #10
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

I do not know what kind of generator it was. I just bought the motor. There surely would be a wire for the glow plugs, and possible one for the emergency shut off. I have about 5 or 6 wires that I would like to know what they are for.
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Old 20-11-2013, 11:21   #11
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

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Originally Posted by Calusa Sailor View Post
I do not know what kind of generator it was. I just bought the motor. There surely would be a wire for the glow plugs, and possible one for the emergency shut off. I have about 5 or 6 wires that I would like to know what they are for.
is there a control panel?
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Old 20-11-2013, 11:23   #12
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

yes, but it is shaky at best. I will have to replace it before I get underway.
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Old 20-11-2013, 11:41   #13
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Re: Wiring Diagram for Mitsubitshi S3L2 engine

here is your engine,these guys were very helpful sending me pdf files of my 33hp,discontiued mitsibushi engine.
there is a help section on the home page.
but my guess is the wiring will have been done by the company that put together the genset

S3Q2 ENGINES - Diamond Diesels
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Old 20-11-2013, 15:05   #14
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My Westerbeke 8.0 has the same engine. It only has wiring for the start & charge circuit & the safety shutdown circuit, if you post some pics of your unit I may be able to help you identify what your wanting to find.
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Old 21-11-2013, 10:39   #15
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I'm considering buying a boat with a 42hp vetus. Done a pile of online research. The smaller vetus m3.28 is the marinized version of your Mitsubishi. Vetus online has all the parts docs and ops docs and wiring line diagrams. The vetus engine is stamped with your Mitsubishi model and is referred to in the operator manual so typical electrics will be identical.

It's harder to find Mitsubishi doc, but I have seen those as well - but they are all industrial applications so you have to do se translation. Hope that helps.
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