1956 Johnson 30 hp RDE-18 12 volt conversion

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Rockriverine

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Feb 11, 2013
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I recently bought the above motor and want to run it on a 12 volt system.

As I have learned from prior posts, I know I need to reduce the charge to the Choke Solenoid to avoid frying it.

What I'm not sure of is the history of this motor. Prior owner was a collector who had it in his stable but never used it, so Im at least one owner removed from past maintenance and mods.
I'm replacing the impeller and checking all the consumable parts.

The big question is how can I tell if the solenoid is a 12v or 6v?
I looks just 12v on my 58 18hp Johnson, so I'm not sure. Are there are tell tale visual traits? Markings?
The Starter Solenoid appears bigger than on the 58. Any insights? Thanks

Steve
 

HighTrim

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Re: 1956 Johnson 30 hp RDE-18 12 volt conversion

The choke solenoid will be marked on the bottom with 12V, the 6 volt choke solenoid will have nothing.

You could also just wire in a resistor, they can be found at NAPA

6V resistor.jpg
 

F_R

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Jul 7, 2006
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If it is running correctly, it will start almost instantly. No need to grind away on the starter.
 
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