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Old 04-26-2010, 03:45 PM   post #1 of 8
fishfood
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Default JD STX38 - Yellow Deck Wiring

New to the group; hopefully I can contribute a thing or two after I've learned a little.

Does anyone have a wiring diagram for a John Deere STX38 yellow deck, kohler CV 12.5 S, Engine Serial No. 2022108938? The tractor information was too worn to gather any information from it. I'm looking for the complete riding mower wiring information - I found the parts wiring diagram, but I need something more specific.

My issue:
The engine dies when the PTO switch is thrown to engage the blades. I have checked the voltage at the clutch (12v pretty solid), replaced the battery, and cleaned the ground connections (on clutch, main ground, and at terminal conn. to battery). The clutch itself and the deck work great - I wired the clutch directly from the battery when the mower was running. The blades engaged great. The seat safety switch works (tried jumper across the connection, tested for continuity, and tested with it unplugged). When unplugged, it won't go into gear without killing the engine. The continuity tests perfect. No change with jumper.

I don't know where to find the clutch safety switch (which I've seen on a couple of posts) so perhaps this is the issue? A couple of wires have been spliced together near the clutch, so maybe the switch has been bypassed. The tractor works great and all gears drive the mower with no problem. This mower was a mess when I got it. I didn't purchase it with anything working other than the engine would fire up.

The other issue is that a wire from the coil has been cut on the side of the engine (plugs into a wiring clip that also has a wire that draws power from the stator). This cut wire is traced back to the ignition switch, but I'm not sure what it's doing from there. If I splice the wire back together, the engine will not fire up. If cut as is, the engine works great and the tractor will drive.

Any help would greatly be appreciated!

Lance
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Old 04-26-2010, 06:10 PM   post #2 of 8
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Default Re: JD STX38 - Yellow Deck Wiring

Hello, Fishfood, and welcome to MTF. Hopefully we'll get you up and running. Look for a PM from me on this question.


Look at this thread:


http://www.mytractorforum.com/showthread.php?t=124786
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Old 04-26-2010, 06:13 PM   post #3 of 8
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Default Re: JD STX38 - Yellow Deck Wiring

Reverse switch maybe.

Doubt the wiring diagram will help since of alot of what is going on is logic on the interlock board.

EDIT: Manual trans huh?
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Old 04-26-2010, 06:29 PM   post #4 of 8
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Default Re: JD STX38 - Yellow Deck Wiring

Item 7 on the attached is your neutral safety switch.

So its on top of transaxle.
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Old 04-26-2010, 10:48 PM   post #5 of 8
joecdeere
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Default Re: JD STX38 - Yellow Deck Wiring

Lance, there are 4 serial number breaks in the yellow deck series alone, this is the earliest one, maybe it will help guide you some, if you could even only get me the last six numbers off the serial number tag on the tractor I could get you the correct one for sure

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Old 04-27-2010, 10:06 PM   post #6 of 8
fishfood
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Default Re: JD STX38 - Yellow Deck Wiring

Thank you guys for the quick replies - I've been out of town all day today and finally got back to the computer. I'll look for a few numbers if any are left. Is the sticker the only place to find them?

I'm planning to jumper the seat safety switch again to see if this is still somehow causing problems. According to the diagram above, it looks like the additional wire coming from the igition module is supposed to be linked back into the key switch and will ground out when the key is turned off. For some reason, when I connect this wire, the engine will not start - so I wonder if all of the problems could be related to the key switch. The power is obviously coming from the key switch wire. Since I have no headlights, I wonder if the power from that loop is completing the circuit toward the lights and is grounding out causing the mower to die.

Joecdeere, thanks for posting the diagrams - any chance I could see the other three to compare them? I'll try and find a serial number for you guys to help me narrow the search.

Thanks again!
Lance
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Old 04-28-2010, 05:54 AM   post #7 of 8
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Default Re: JD STX38 - Yellow Deck Wiring

I have a manual on disc for the STX38 and with the serial number range he posted in his first post his unit is the latest version of the wiring diagram, but that's not to say that joecdeere's book is arranged differently than my disc.
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Old 04-30-2010, 08:20 PM   post #8 of 8
fishfood
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Default Re: JD STX38 - Yellow Deck Wiring

After looking at the wiring diagrams above, I jumpered the neutral switch. This didn't have any effect, so I moved on to some wire testing. I went off of hunch regarding the light switch and actual lights being installed. If the light switch and lights to resist any current, I thought maybe the circuit was just grounding out. After I unplugged the one wire leading from the PTO switch to the light circuit, it all worked great!

I'm surprised how well this mower cuts.

Thanks for the help and suggestions on repair, you guys saved me a fortune in repairs.

-Lance
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