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Hey fellas I recently had a kill switch that's not killing my motor . I replaced it and still having the same problem. I am getting voltage to the kill switch also I have continuity from the body of the boat and the ground wire at kill switch (aluminum boat). What else should I check.
What motor? Make sure that ground is good all the way to the motor.
150 optimax I guess I'll Chase the wire to the motor I had my switch replaced àwhile back could that be it.
Ohm out the switch to make sure it has continuity through it: Disconnect switch from outboard, no power to switch and then use volt/ohm meter to verify switch is opening and closing. If it doesn't close it will not work.
I put in a new switch and it still isn't killing the engine also checked the ground wire at the switch and it has a good ground.
Quote:
Originally Posted by fishingman
Still sounds like a poor ground. Use a ground directly from the battery when testing. Check voltage on both sides of the switch with the switch activated. If you have any voltage on the switch you have a poor ground. If no voltage at switch check the 12volt + wire for a poor connection or partial break or corrosion.
Hope this helps.
Does the key switch kill the motor?
Yeah, if the key switch works properly then you have a defective kill switch or its installed wrong. Simple quick test can be done with an ohm meter. Turn the key on. Find the black/yellow wire at the switchbox(s). Put 1 lead on it and the other on a good ground. With the kill switch in the run position you should see an open circuit. With the kill switch tripped you should see continuity (very low ohms).
I put a new kill switch in and it's doing the same thing what's the chances of a new one being bad
The chances of the first one being bad are very low. The chances of the replacement being bad are much lower. Do you have an ohm meter?Quote:
Originally Posted by Big tiny
Yeah ohm it out open and closed I also checked it from ground-to-ground and I had a good ground
And the switch tested good? (on-off)
I touched it to ground and it ohmed out to ground aluminum boat .
I can't say for certain by your response that you tested the switch but if you know the switch is good, then the problem is most likely at the ignition switch that you mentioned having replaced earlier. One of the two leads coming off the kill switch should go to the ignition switch and pair up with a black/yellow wire. The other should either pair up with a black wire on the ignition switch or tie into a grounding block.
Ok I'll check that next
The kill switch is designed to operate two ways. Both ways the switch takes the voltage and shunts it to ground (the frame of the motor). The first way is by (pushing the kill switch with your finger,second you should be able to ground the motor by pulling the lanyard out of the kill switch. Basically what is happening in both these two methods are doing the same thing, meaning the switch closes-not opens(the voltage is dropped to a point that the engine cant run by taking the 12 volts to 0 volts by shorting it to ground. BTW i wouldn't tie the aluminum boat to the ground of the battery.Just my 2 cents worth.
Although many smaller, tiller handle outboards have a "push to kill" function that you described, Mercury uses a toggle switch that is lanyard operated. Also, the voltage of the kill circuit varies by make and design but specific to the OPs motor, should be <2vlts if memory serves. As for grounding to the boat, It really doesn't matter in an electric start motor application. The fact that the motor is bolted to the aluminum hull automatically makes the hull a negative ground.Quote:
Originally Posted by fishingman
Of the possible failures that could create the problem the OP is experiencing, one possibility is that there is a failure of the ignition circuit to "kill" the ignition by means of grounding the circuit. Since the ignition switch feeds power to the PCM when in the on position, the key will not only apply a ground to the "kill" circuit but also cut off power to the PCM when moved to the off position. The kill switch only applies a ground to the ignition component.