Help with wiring Kill switch..

S

sandman28

Been Around the Block
The aftermarket control switch I have has this wiring for kill switch (see pic below), one wire for coils, one for ground
I assume the power to the coils simply need to go in to one connecter, and then out to coils. Unsure of the ground, it goes in one connector and then out to.. where ??
Thanks.
 

Attachments

  • photo.JPG
    photo.JPG
    67.7 KB · Views: 261
What make and model of bike, and is the kill switch normally open or normally closed?
 
CB350 with Dyna 5 ohm coils. this is the switch http://tinyurl.com/m693uem
I guess it would be normally open.. the switch is a little lever that returns automatically. as is hold it down to kill then releases.
 
You'll want to test with a multimeter to be sure, but if it is NO, you're going to want to get your hands on a 5 pin automotive relay. Push-button kill switches don't generally work kettering ignitions without some changes.
 
OK. only kill switches Ive wired before where on smaller 2 strokes and where simple 'ground to kill" right off stator. why would I need the relay ? how to wire ? where does ground run to off switch ?
 
You need the relay because your bike doesn't run from a magneto. The kill switch on a kettering system is the power switch for the coils. The breaking of the ground on the contact points is what generates the spark. In a magneto system, the magneto generated power just for the coils but on your bike the coils get power from the rest of the harness. There is no ground for the kill switch in a kettering system. Hope that made sense...

Anyway... a five pin automotive relay can be used in NC mode by utilizing pin 87a. In your harness, you'll want pin 30 on the relay going to a black wire in the harness. Pin 87a then goes to the black/white wire that leads to the ignition coils. Pin 85 should then be grounded (or connected to a green wire in the harness). On your kill switch, one of those wires goes to a black wire in the harness and the other wire goes to pin 86 on the relay. Pin 87 is unused and should be isolated to prevent it from causing a short circuit.

So in NC operation, the relay will transmit power through pin 30 to pin 87a. However, if power flows through pins 85 and 86, the relay triggers and changes the path of the power to pin30 and 87. The power that was previously going to your coils through 87a is no gone and the coils stop firing.
 
whoa! :) I guess my next question would be.. is the simpler kill switch only unit I could use instead of kill switch on the all control LH switch I have?... something with more simple wiring .?
 
ha.. for sure! thats prolly what ill do.. would you simply wire it into the main power feed to coils ?
 
cool, well doubt ill find a handlebar mounted on/off switch locally. so Ill leave it off for a while.. like the safety of a kill switch.. but Ive been working on my build for 7 months and Im a day or so from being "done".. not gonna wait for a switch in the mail to ride!! but it will be easy to add on next week.
 
http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-electronic-parts-retro-black-handlebar-mounted-kill-switch-21-1219.html
 
i did "test" the kill switch on control I have before. just with a light, ran power in one connector, out to light from the other. when I pushed the kill the light went off, let it go the light came back on... so I guess im a little confused still as to why I can run the power to coils the same way and kill it that way.??
 
nevermind.. did the same test i though I did before, it didnt kill power to the light. Ill go with that simple switch from DCC. Id rather have the Kill on right side anyway on its own.
 
You must log in or register to reply here.

DTT Light or Dark

  • DTT Light
    • www.jadusmotorcycleparts.com
    www.lostapostle.ca/
    www.sparckmoto.com

    Spread the Love

    Back
    Top Bottom