72 Evinrude 40hp 40253e Wiring

[carpking]

I just said that it connects to the red wire on the start switch. I don't care if it is an ignition switch or a push button or a mouse trap----there is a red wire supplying battery power to the switches.

I appreciate all your help....I really do; but how could I take what you have written here any other way than putting the choke lead on the hot side of the ignition switch? Thanks for your help. I won't bother you anymore.

 

[MTboatguy]

The start switch is not always hot, it is only hot in the start position, not the run position and not the off position. Push button or key, it is only hot, when the button is pushed or the key is in the start position, once you let it go, either button or switch there is no longer power going through it. When you push the button to start, the choke will engage, when you release the choke will dis-engage and as long as it is not depressed, there will be no power going to the choke solenoid to activate the choke.

 

[carpking]

The start switch is not always hot, it is only hot in the start position, not the run position and not the off position. Push button or key, it is only hot, when the button is pushed or the key is in the start position, once you let it go, either button or switch there is no longer power going through it. When you push the button to start, the choke will engage, when you release the choke will dis-engage and as long as it is not depressed, there will be no power going to the choke solenoid to activate the choke.

Actually, on the battery side of a push button switch, you will have constant voltage. It is essentially an extension of the battery's positive post. The other side, white wire, is dead until the button is pushed allowing the voltage to travel through. If the choke doesn't require constant voltage, it would seem to me that choke wire would be on the white wire side of switch...only receiving voltage when button is pushed. On the hot side, the choke would be engaged constantly, slowly draining battery even when engine wasn't running or being started.

 

[MTboatguy]

Actually, on the battery side of a push button switch, you will have constant voltage. It is essentially an extension of the battery's positive post. The other side, white wire, is dead until the button is pushed allowing the voltage to travel through. If the choke doesn't require constant voltage, it would seem to me that choke wire would be on the white wire side of switch...only receiving voltage when button is pushed. On the hot side, the choke would be engaged constantly, slowly draining battery even when engine wasn't running or being started.

You have just answered your own question. Thank about what you just posted. That should tell you which side of the start button to hook your choke wire up to. Don't hook it up to the side of the switch that directly connects to the battery, this is the same way the starter should be hooked up, once the starter has done its job, it no longer require 12 volt.

 

[carpking]

Some electric chokes require constant voltage. They have a "heater" for lack of a better word, that actuates choke according to run conditions. Not being experienced with electric chokes on outboards, I wasn't sure how this one worked. I figured if it needed constant voltage, the engine would need a generator to help charge the battery. This engine doesn't have one. That's the only reason I kept asking ...what seemed like the same question.

 

[MTboatguy]

The Johnson/Evinrude does not require constant voltage as there is no "heater" in it. This is not a slight on you, but you are over thinking this situation, older outboard are pretty simple systems. Think about simple electrical systems, with no computers in the system, these are not smart systems, they are simple systems, they have one function, you need to energize the starter and the choke to get it going, then the engines supplies its own power to fire the plugs, that is all there is to these systems.

Ignition systems and run systems were pretty simple things back in 1972.

 

[F_R]

For cryin' out loud--it just keeps getting worse. The factory wired the choke switch to the "A" terminal on the IGNITION switch and that was only hot when the key was turned on. But you are not using an ignition switch, so the choke switch has to be connected to the hot wire (red) coming from the battery, and yes it is hot all the time. But otherwise, how are you going to "bump" the choke for an extra shot of gas if it wants to stall after a cold start. If it were connected to the white start wire, you would have to have the starter running in order to operate the choke. The RED WIRE is hot all the time, but the PURPLE/WHITE choke wire is hot only when the choke button is pushed---not all the time, and it isn't going to run the battery down.

I need to open a basic electricity school. But I'd probably drive all my students crazy...or vise-versa.

 

[MTboatguy]

If it is getting worse, then why in the heck did you jump back in after you already said you were done? What a jack off, you have been nothing but cantankerous since you started on this thread. Why don't you take a picture or scan the wiring diagram you have so others can see it?

 

[carpking]

Here's tge thing this engine is a pull start OR an electric start. This means that I shouldn't even NEED a battery to run it at all. If the choke REQUIRES constant voltage, why in the world would Evinrude even put the pull start mechanism on the engine?

I know....I'm just poking the bear now. Nevermind....

 

[F_R]

For one thing, it's copyrighted.

 

[MTboatguy]

I am sure Evinrude/Johnson wouldn't mind as they are posted all over the internet now a days. Informational diagrams can be posted and shared as long as it is not done for payment or financial gain, based on current US Copyright law.

It is quite obvious, there are two involved in this thread, one that does not understand the concept of teaching and one that does not understand the concept of outboard motor wiring.

Maybe I should just take a picture of my Evinrude 40 with electric start and post it, then nobody will have to worry about copyright.

I will let you two keep poking each other.