1968 40HP Johnson

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gldtiger

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Hello, I just bought a 40 HP Johnson outboard engine, 2 cycle Model# RDS-30S
the fellow I bought it from cut the wires and didn't know which was which.
There is a large red & large Black (-) & (+) battery.
There is a smaller black, smaller white, smaller Grey. One Red with white stripe , a brown and another black. Does anyone know where these go?
Thanks a lot. :)Merry Christmas.
Chuck
 
samo_ott

samo_ott

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Re: 1968 40HP Johnson

Electric shift or manual shift?

Here's a wiring diagram for an older manual shift, it will be quite close.

50:1 oil/gas ratio. check your water pump impeller and lower gear unit oil before testing. And having a manual will help a lot if you plan to keep it. Those engines were around for a while so parts are easy to come by.
 

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F_R

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Re: 1968 40HP Johnson

RDS-30 is a manual shift. Electric shift was Rk-30. Here is the diagram for a RDS-30. Ignore the generator parts if you don't have one.

EDIT: If no generator kit, the green wire connects to the "bat" terminal of the key switch, and the brown wire is not used. Also, no ammeter without the generator kit.
 

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gldtiger

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Re: 1968 40HP Johnson

Hi Steve
Thanks a lot for your reply.

Do you know which wires I put together to start the engine?
I know which to put together to run the starter but don't know which to jump to turn the spark on. I don't have any key switch, just the wires. All I have to do is jumper two wires to turn the spark on I am pretty sure.
I have cleaned the motor up very good and am almost ready to test run it.
Thanks for your answer.
Chuck
Merry Christmas and Happy New Year. Have a safe one.
:)
 
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boobie

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Re: 1968 40HP Johnson

Why would this guy have cut the wires? Hope the mtr is not a little "warm".
 
bktheking

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Re: 1968 40HP Johnson

As long as the 2 black wires aren't tied together (seperate) it SHOULD have spark when cranked, all the battery does is drive the starter, they have a self contained ignition system (magneto).
 
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racerone

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Green wire goes to battery terminal.-----Brown from generator goes to the other .terminal.-----That way the needle will deflect the correct way to show current flow to or from the battery.
 
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