Installing "stop" switch on Johnson....

[tallcar]

I have a '58 Johnson 18 hp. I bought it and someone had added a starter and associated bracketry. This had been set up on a pontoon. They had nothing that I can find to actually stop the motor when it is set up with steering and throttle controls. I am wanting to know where do I connect the "kill" switch wire? I think one needs to attach to the mag plate, but where does the other connect to, the block? Any help will be appreciated<br /><br />

 

[petrolhead]

Re: Installing "stop" switch on Johnson....

I have one of those motors, doesn't it have a kill switch on the front, just behind the "carry handle", it has a black rubber boot over it?<br />You can extend the wires to your dash, I believe the switch just contacts the two wires together and they earth out the coils.

 

[tallcar]

Re: Installing "stop" switch on Johnson....

no that is not the case, someone went to the trouble to get all the parts and added them to this motor to make it an electric start, except they only added the two wires that run to the starter seloniod, (positive and negitive cables only), so I only have a pos and neg battery cable to work with , this motor is was not originally an electric start. I have added a seloniod to the pontoon, and ran wires accordingly from the battery to the seloniod, then the seloniod to the starter. I just need to have the knowledge of where to connect the kill switch wires.. thanks...

 

[WillyBWright]

Re: Installing "stop" switch on Johnson....

You need to run wires to the points. When they're connected together, they cancel eachother out and kill the spark. With an outboard ignition switch there is a pair of contacts labelled M that close when the key is turned off. You'll find that only in outboard ignition switches, so if you don't have one...get one. The kill circuit is completely separate from the other connections in the switch. If you were to try to pump 12 volts to the coils, they'd blow up...literally. Back then you either idled them down to nothing or choked them to death. There was no kill provision until a few years later when electric start became more popular and available.

 

[tallcar]

Re: Installing "stop" switch on Johnson....

is there any place in particular that I need to connect the wires on the points?, or does it not matter, I assume the I need to run a wire from each set of points to oposing sides of a stop switch, then when the button is pushed it then kills the system.... hopefully it is that easy..<br /><br />Again thanks<br /><br />Richard

 

[rolmops]

Re: Installing "stop" switch on Johnson....

If it has a remote electric starter,then it probably also has a remote choke.On the '57s the choke is also the stop button.It should work just as well on the '58

 

[tallcar]

Re: Installing "stop" switch on Johnson....

rolmops, as stated in an earlier post, this motor was not originally built with electric starter, so this is all added afterwards. it has manual choke, manual everything, this will be setup on a pontoon, so manually stopping it with the choke will not work, my father-in-law is 80 years old, if i can set it up from a seat the all the better..

 

[rolmops]

Re: Installing "stop" switch on Johnson....

I see the problem.However you may very well want to add an electric choke which is not much more than a carburetor with a solenoid under it(these are easily available ) ,some wiring and a push button.This would save your father in law the trouble of having to pull the choke manually and at the same time it would give you the stop button.