Introduction and seeking assistance.

[ArmyDoc]

I’m im glad to be here. Thanks for letting me in.

I just purchased a 1989 Marathon 21ft open fish and ski boat.
came factory with 5.7, but has a 5.0 gm in it now.

there are disconnected wires near coil, and sheared wire near alternator.

looking for correct manual and wiring schematic for this engine:

mercruiser tag on block above and aft of starter shows SN 6361613

Does that SN match the info from the bottom line of the attached motor list?

 

[ArmyDoc]

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[ArmyDoc]

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[ArmyDoc]

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[ArmyDoc]

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[alldodge]

Howdy, I think your 305 would be 1985 to 1986 model

https://www.mercruiserparts.com/230-4-bbl-gm-305-v-8-1985-1986-6218

 

[ArmyDoc]

Howdy, I think your 305 would be 1985 to 1986 model

https://www.mercruiserparts.com/230-4-bbl-gm-305-v-8-1985-1986-6218

Does that also include the 2bbl carburetor that I have. The link is for four bbl. everything else should match though?

 

[alldodge]

Yes, but here is the 2bbl
https://www.mercruiserparts.com/200-2-bbl-gm-305-v-81-1985-1986-621

 

[ArmyDoc]

Yes, but here is the 2bbl
https://www.mercruiserparts.com/200-2-bbl-gm-305-v-81-1985-1986-621

Thank you very much!

 

[Alumarine]

Using the info from alldodge for the motor you would need manual #9 part no. 90-14499.
There's an online version here. You will need adobe flash to open it and maybe firefox.
http://boatinfo.no/lib/mercruiser/manuals/mercruiser9.html