Replace stop button with kill switch

[Easy Touch]

Hi, I have a 1992 4hp Johnson 2 stroke and I am looking to replace the stop button on the front with a kill cord button. At present the stop buttons has 3 wires going into it, 1 black/yellow then 2 black. One of the black wires is connected the housing and then the other 2 wires run to the ignition module. The kill switch I have is a 4 terminal, so one pair of terminals is closed then open and the other 2 are the opposite when the kill cord is removed.

Am I right in thinking that I can connect both black wires to one terminal on the kill switch and the black/yellow to the other. Then when the cord is pulled the circuit with be completed and the engine will "ground out" to stop?

Many thanks

 

[matt167]

I have a '97 4hp with a kill cord. I'll check it out tomorrow and see. The '92 vs '97 are mostly identical

 

[Chris1956]

Black/yellow is the wiring color for the ignition kill circuit on most OBs. Black is the wire code for ground on most OBs. Connecting those together will kill most ignitions. I have never researched your motor however.

 

[oldboat1]

My 9.9 kill switches are two pole switches with black to ground on one side, and black to the power pack on the other side. The power pack connection is via a connector with (I believe) a striped wire going to the pack. Pressing the button completes the circuit, shorting the ignition. The clip in a man-overboard switch opens the circuit, and removal by pulling the lanyard completes the circuit.

I think your fix in post 1 would work, although I'm thinking that simply inserting the kill switch in the black ground wire to the housing would do the job. To test before installing, you could cut the wire and see if that kills the engine. (Repair is easy enough if necessary.)

 

[Easy Touch]

Hi, I bit the bullet and started to cut wires, both the black wires were constant grounds and the black/yellow was a switch ground. I placed both black wires to one terminal on the back of the kill switch and the black/yellow one to the opposite terminal. So when the button is pressed or the lanyard is removed the circuit is complete and the ignition "grounds out" stopping the engine, all good now. Many thanks

 

[oldboat1]

Well done! (probably useful for the next issue: https://www.ebay.com/itm/114307368913?hash=item1a9d4007d1:g:ihYAAOSw7z9fEG2k ) Good boating to you.