JD X749 starter solenoid without power

[Mike VS]

Hey everybody,
My JD X749 w/ Yanmar engine is giving me fits. The starter has been finicky for about a year being reluctant to turn over. It seemed if I finessed the key as I was tuning the key it would finally engage. Assuming it was the switch I changed it out without success, and continued using it as is. Then I tried to start it and no amount of playing with the key/ switch would get any results turning it over. I looked inside the solenoid, and it was pristine, but found that there is zero power going to control start wire. A temporary switch connecting power to the solenoid starts it up 100% of the time which is how I have been starting it for a week now. Still no power to the factory control wire.
Trying to find the problem is beating me down. There is power leaving the ignition switch but nothing arrives at that purple solenoid wire. I have checked the relays (replaced both), found the seat safety and brake switch are both good. Fuses are clean and good. The 3 fusable links are all good. I have looked over the wiring schematic, but I'm about a 2 on a 5 scale understanding one. One thing I read that stood out was someting saying the "A1 Display Panel" could be bad.
Does this mean the actual display on the dash? It works perfect and shows no problems, and I sure dont want to buy one for nothing. What am I missing?

 

[loggin]

Hey everybody,
My JD X749 w/ Yanmar engine is giving me fits. The starter has been finicky for about a year being reluctant to turn over. It seemed if I finessed the key as I was tuning the key it would finally engage. Assuming it was the switch I changed it out without success, and continued using it as is. Then I tried to start it and no amount of playing with the key/ switch would get any results turning it over. I looked inside the solenoid, and it was pristine, but found that there is zero power going to control start wire. A temporary switch connecting power to the solenoid starts it up 100% of the time which is how I have been starting it for a week now. Still no power to the factory control wire.
Trying to find the problem is beating me down. There is power leaving the ignition switch but nothing arrives at that purple solenoid wire. I have checked the relays (replaced both), found the seat safety and brake switch are both good. Fuses are clean and good. The 3 fusable links are all good. I have looked over the wiring schematic, but I'm about a 2 on a 5 scale understanding one. One thing I read that stood out was someting saying the "A1 Display Panel" could be bad.
Does this mean the actual display on the dash? It works perfect and shows no problems, and I sure dont want to buy one for nothing. What am I missing?

Have you checked the wiring for rodent or other damage?

 

[Mike VS]

Yes I have. I have looked everywhere and it all looks good. Thanks

Have you checked the wiring for rodent or other damage?

 

[Williy]

Wires can look good but have you cleaned all the
connections and ohm the wires if there is a break
in the wire you can't see it for the coating on the wire

willy

 

[Mike VS]

Wires can look good but have you cleaned all the
connections and ohm the wires if there is a break
in the wire you can't see it for the coating on the wire

willy

Yes, I know this but the problem is access to most of the wires. Most are protected in a plastic conduit and run through portions of frame and body that you just can't get to without complete disassembly. The possible dash problem that the schematic notes is what I have zero capability to diagnose.

 

[loggin]

Yes, I know this but the problem is access to most of the wires. Most are protected in a plastic conduit and run through portions of frame and body that you just can't get to without complete disassembly. The possible dash problem that the schematic notes is what I have zero capability to diagnose.

It sounds to me as though you may not be able to access certain things without considerable work to diagnose the issue properly. Might be more cost effective to just use the rewiring you have already done and leave it at that..?

 

[Mike VS]

That's not my preference, but I have already resigned myself to that scenario. It will go right back to the starter lugs of the ignition switch. Thanks

 

[Gator6x4]

If mine I would visit the local JD Dealer and talk to the service manager. I would ask if he could provide me with a wiring schematic for the X749. Since you say you have replaced the switch you are familiar with how to remove it. Take the schematic and determine the post and wire color at the switch. Check the schematic and determine if the wire leaves the switch and goes to a relay. If yes the relay will have a 12 volt source. This twelve volt source will have a fuse. Your problem may be as simple as the fuse is blow. If the fuse is good and you have 12 volts going to the relay remove the wire coming to the starter solenoid connect a volt ohm to this wire and turn the ignition switch to start position. Do you get a reading of more than 12 volt. If yes your solenoid needs to be checked. (If you can straight wire the solenoid and it starts the unit I do not think this will be your problem.)

My thoughts are the relay is defective if it has one or the wire either from the switch to the relay or the relay to the starter solenoid is defective. So you need to determine the wire color coming from the switch and follow it until you find where you are losing voltage going to the solenoid.

 

[Mike VS]

Thanks, but as my post stated every bit of this was done including all voltage checks, replacing relays and ignition switch, and checking the solenoid. The fact that my temporary wiring has it starting perfect shows there is nothing wrong with it.
There is a bad wire hidden in the loom somewhere or it's the dash that the wiring diagram (which I already have) mentioned and do not know how to diagnose.

 

[oldnslo]

Mike,
In looking at the wiring diagram is does appear that power to energize the start solenoid does come from A1 display panel purple wire. I also am only so - so on following electrical schematics and I could not determine what input(s) are required into the A1 Display to get the output. My son has an X749 that caught on fire so wiring harness is no where close to factory and has been that way for several years now. Page 162 of the TM2350 Technical service manual provides a pretty good sequence of operation on what switches - components need to be in what position for the start circuit to be active. Appears to be tied to PTO/RIO and brake switch through the A1 display and possibly others