Spartan Keypad issue

[gary.yarbrough]

my spartan RT Pro with kohler kt745 will not crank with both kill wires attached. I can disconnect either one and it cranks and runs but only firing on cylinder with kill wire disconnected. I can disconnect both and it turms over but does not crank. As soon as I plug the other kill wire it dies. I feel like I have a keypad internal issue as all 4 safety switches test good. Any ideas would be greatly appreciated...

 

[bertsmobile1]

OK Gary , I am not trying to nit pick but you need to be a little more careful with your descriptions
Crank = rotate
Fire = spark or at least go pop

Now what I think yur are saying is it will rotate ( crank ) but not fire if the kill wires are connected to the coils and when disconnected it will only fire on one .

Now the kill circuit is a ground circuit so remove the kill wires and check each one, one at a time for continuity to ground
Off should closed circuit
On should be open circuit

Get back & let us know what you find .

 

[gary.yarbrough]

yes you are correct it will rotate but not fire. I have traced the kill wire back through the harness. It appears the spartan keypad has incorporated the diodes into the push button keypad. I suspected bad diodes origionally on the kill wire but could not find them. Im getting closer to figuring this out but was hoping someone could confirm what I was thinking (bad diode). I am thinking of doing what Briggs does with the dual diode (1n4007) inline with the kill wires, because I believe the diode setup is in the sealed pushbutton keypad.

 

[bertsmobile1]

Not likely to be a bad diode
They just prevent feedback & phantom sparks at the wrong time
Remove both kill wires at the magnetos then crank engine & check for spark .
IF you get one then either one of the safety switches is bad or the control module is bad $$$$$ .

I usually do a process of elimination by either unpluging or jumping each switch, one at a time till the engine fires
If by the time you have done this to all of them and it does not fire that only leaves the module

 

[StarTech]

yes you are correct it will rotate but not fire. I have traced the kill wire back through the harness. It appears the spartan keypad has incorporated the diodes into the push button keypad. I suspected bad diodes origionally on the kill wire but could not find them. Im getting closer to figuring this out but was hoping someone could confirm what I was thinking (bad diode). I am thinking of doing what Briggs does with the dual diode (1n4007) inline with the kill wires, because I believe the diode setup is in the sealed pushbutton keypad.

What Briggs setup is doing with the kill harness with diodes is done by Kohler in each ignition coil. A diode in either coil can cause a non fire condition they are both are connect to the harness. Usually you end up replacing both coils when this happens.