Walker MT

[lefty]

MTGHS
SN: 105979
EFI
CH735S - 3012
SN 4006002291
3/01/2010

Starts and runs. After a period of time, around 5-10 minutes, it dies. It will start right back up and do the same pattern. I've tried running a loose gas cap with the same results.
I was able to capture the event with a spark plug tester. It looked to me that the spark would die during the event. This led me to believe I had an electrical issue. I was thinking the safety circuit. The event occurred whether the blade was engaged or not. But I noticed that the brake has no impact on the seat circuit. You don't need it engaged the brake to start the machine or get out of the saddle. I'm not sure if that's normal.

I followed the seat safety wires to a connector and found this. https://photos.app.goo.gl/BygPaWtrPdtBpysC6
I cleaned it to this: https://photos.app.goo.gl/dTFEF2xVQ13Adbyp8

I thought this may be my problem but the problem persists.

I've visually inspected everything that I can see that seems may be causing the issue, wiring, etc. I can't see anything that jumps out. Seems electrical to me because when it dies, it dies. It doesn't falter, burp, cough, or anything like that. It just dies.

Thank you

[bgsengine]

But I noticed that the brake has no impact on the seat circuit. You don't need it engaged the brake to start the machine or get out of the saddle. I'm not sure if that's normal.

Many of the commercial zero turns, you only need the park brake engaged AND / OR the lap bars "docked" to their neutral detents (often both) to start - don't need seat switch in that case. However that'd hav no bearing whatever on the run circuit , although you COULD have a fault in seat switch or safety circuits (such as brake switch showing as "engaged" while moving lap bars out of detent - some machines have that as a feature to keep from tearing up your hydro units, and will kill ignition through that circuit... So if brake is engagd when you pop the lap bars out of neutral detents that may be what is killing engine, or if it "sees" brake switch activated , such as via a short or other failure while driving...)

I followed the seat safety wires to a connector and found this. https://photos.app.goo.gl/BygPaWtrPdtBpysC6
I cleaned it to this: https://photos.app.goo.gl/dTFEF2xVQ13Adbyp8

I thought this may be my problem but the problem persists.

I've visually inspected everything that I can see that seems may be causing the issue, wiring, etc. I can't see anything that jumps out. Seems electrical to me because when it dies, it dies. It doesn't falter, burp, cough, or anything like that. It just dies.

Thank you

OK unlikely to be an ignition coil issue due to it starting right back up (according to you) so I would tend to think it is a momentary short or open circuit in one of the shutdown circuits (switches) One way to verify would be to find the ground connection wire at the engine harness (assuming it is not a powered ignition system needing 12v which some Commands may have still) and separate that from the machine harness - disconnecting all kill switches from actually killing the engine, (you could hook in a DVOM to that machine side connector to monitor when it is pulled to ground, for example while engine stays running since nothing to kill engine with) However you WILL need to think through how you're going to go about shutting engine down when done with testing...