Need wiring schematic for Craftsman T900

[nbpt100]

I am stumped on an electrical problem with a Craftsman T900 lawn tractor. Model number 247.203791. It is made by MTD and the companion MTD number is 13AP79XT099. DOM is 2015.

I have searched on line and have not come up with anything helpful. If anyone has a PDF and can share it, I would appreciate it.

 

[RandyT]

MTD doesn't have wiring diagrams. And if they do, they don't even share them with their dealers.

What is the electrical problem you are having

 

[nbpt100]

Someone brings me this mower after they and their brother inlaw messes with it. They said it would not crank. They charged the battery, changed the solonoid and checked the fuse. Still no crank. They jumped the starter and it turned. There were guessing on the solonoid. They did not test the old one. The

I bench tested all of the interlocks and they work. I saw some home made wiring repairs under the battery and I am suspicious of them. I saw one green wire going no where. That may be correct as it was not stripped and in a bundle tie wrapped together.

This has one of the newer MTD key switches with the light and push button for running with the PTO on while in reverse. I am not sure how that is suppose to check out. Wiring diagram will be very helpful.

I rung these out.

While in the R-F position
B to A1
L to A2
In the F position
B to A1
In the start position
B to A1
B to S
In the Stop position
A1 to G
A1 to M

The box with the 6 prong connector is a mystery to me . I assume there is a relay inside of it that holds a contact or two open/closed while in the reverse cutting mode.

I want to repair those wires under the seat before I put the battery back in and see for my self where power is going. If that green wire is suppose to go somewhere I would like to know that as well.

Any assistance appreciated.

 

[MTGreen]

Might be worth your time and the way I would approach it is to make my own diagram of how it is wired now, then trace the power through your diagram. I like to use different color highlighters on the diagram for starting circuit, switched power, ground, etc. circuits makes it a lot easier to see. Once you look at the diagram you should be able to figure out how it is supposed to work and where it got Bubba-ed and show you where you can start testing for power and continuity

 

[RandyT]

See if this helps you

https://service.mtdproducts.com/Training_Education/769-02090.pdf

 

[nbpt100]

See if this helps you

https://service.mtdproducts.com/Training_Education/769-02090.pdf

thanks, this mower is 10 years newer than this document, but MTD does not make a lot of changes. The pto is manual but again a lot will be similar. I hope.
Thanks again.

 

[Richard001]

Here is the operators manual, but unfortunately it does not include the wiring diagram:

Download Craftsman 247.203791 Operator's Manual | ManualsLib

www.manualslib.com

 

[Richard001]

Here is the wiring diagram for the

CRAFTSMAN LT1000 RIDING MOWER​

https://i3.wp.com/www.searspartsdirect.com/manual/L0406318/images/p33-1.jpg?strip=all

 

[nbpt100]

Here is the wiring diagram for the

CRAFTSMAN LT1000 RIDING MOWER​

https://i3.wp.com/www.searspartsdirect.com/manual/L0406318/images/p33-1.jpg?strip=all

thanks, I believe the LT1000 was made by Husqvarna. I do not see any relays on this machine. Unless I Am missing something?

 

[Richard001]

I looked everywhere for a diagram. Even the Russians didn't have one.

Is this your machine or are you trying to repair it for a friend ?

 

[stevem5215]

Russians don't have it but I think this is what you are looking for.
Steve had it. lol

 

[nbpt100]

Thank you . That is the closest I have seen so far. I will confirm more of the wire colors to it later today. Just at first glance it looks pretty good. On a minor note, It does not have an ampmeter on the dash. This might be an option for up graded models. The RMC module has a different number. It is 725-06119A. It may not matter.

Under the battery there is a green wire that is not going anywhere. It may be intentional or it may have been cut by the previous people trying to fix it. The Yellow-orange-white bundle of wires you see are going to the PTO interlock switch. See pic below. If anyone knows where it goes or if it is not being used, I appreciate your input. There are 2 green wires in that bundle. The other green wire coming goes to the solenoid. You can see a bit of it in the pic. This wiring diagram only shows red and orange/white wires going to the solenoid. Just to make it more confusing.

Thanks again. It is a process.

 

[Richard001]

If this were my tractor, I would rip out all the wires and install only what is needed to start, run, stop and turn on the PTO.

 

[RandyT]

Thank you . That is the closest I have seen so far. I will confirm more of the wire colors to it later today. Just at first glance it looks pretty good. On a minor note, It does not have an ampmeter on the dash. This might be an option for up graded models. The RMC module has a different number. It is 725-06119A. It may not matter.

Under the battery there is a green wire that is not going anywhere. It may be intentional or it may have been cut by the previous people trying to fix it. The Yellow-orange-white bundle of wires you see are going to the PTO interlock switch. See pic below. If anyone knows where it goes or if it is not being used, I appreciate your input. There are 2 green wires in that bundle. The other green wire coming goes to the solenoid. You can see a bit of it in the pic. This wiring diagram only shows red and orange/white wires going to the solenoid. Just to make it more confusing.

Thanks again. It is a process.

Green wires may of went to the seat switch.

 

[nbpt100]

The wiring diagram Stevem posted has been very helpful. Some of the colors do not agree but much of it I was able to confirm with my DMM. The only thing that seems a bit off is the wiring for the RMC module.

I took off the engine cover and found a mouse did a number on a lot of the insulation coming from the alternator, one of the spark plug wires and one of the magneto wires. I am going to have to splice in some new wiring. There is a relay on the Kohler engine that controls the anti back fire solenoid.

The stray green wire traced out to a common ground. I would assume it was never connected on that end since all of the switches in that part of the tractor appear to have the correct wiring. I butt connected a wire to it and connected it to the frame creating a better ground path. It won't hurt and may help.
The battery was week and I threw it on the charger.

More work to do before I try to start it.