19hp single cylinder briggs no spark

[Rlex]

Briggs and Stratton 33S877-0019-G1 Simpson Intek Series, 19 HP, 540 cc, Single Cylinder Engine​

I have replaced the coil twice in the past few days each time i diagnosed a no spark situation and replaced coil. each time it started right up and ran till i killed it and would not restart. I have removed the kill wire during troubleshooting, If I understand it correctly removing the kill wire from the coil bypasses all safeties. The magnet on the fly wheel seems strong and the key is intact. I did notice a very slight wiggle in the magnet when using the tip of a screwdriver to move it but does not appear broken.​

Any help would be appreciated.​

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[StarTech]

Sounds like you have stray voltage showing up as you turn off mower instead of ground the coil. IE bad ignition switch can be one culprit.

 

[Rlex]

so this stray voltage is knocking out the coil?

 

[ILENGINE]

Stray voltage will kill the coil instantly.

 

[Rlex]

so a new switch and cleaning the switch connector and ground connections may fix my problem?

 

[StarTech]

Best to test for the stray voltage or you just swapping parts and guessing that is the problem.

 

[Rlex]

not exactly sure how to test for stray voltage, I have never ran into this problem before, its kind of humbling I thought i knew a lot about this stuff.

 

[bertsmobile1]

pull off the kill wire
Plug one side of your meter into it and ground the other
Turn the dial to volts
Turn the key switch on & off , the meter should show 0 volts
Move on lead to the battery +
Meter should read battery voltage key off & 0 volts key on
Do the tests with bake on & brake off

 

[StarTech]

Probably can't fine an analog Volt meter nowadays but it would be the best meter to use as the needle movement is observable. Also a low voltage test light might just do the job too.

All it takes is a fraction of a second to destroy the electronics.

 

[Rlex]

I appreciate the info and will update in a few days after I get back to the tractor.