2010 Workmaster 55 Wiring Diagram - does anyone have one?

[WanaBFarmer]

My WM55 started with intermittent starting problems and now won't start.

I need a wiring diagram to troubleshoot further.

I've traced it to the power to the fuel shut off solenoid.
If I wire the solenoid directly to the battery it operates properly and starts reliably. It draws < 1 amp which seems reasonable.

The safety switches are all operating normally.
the only one that may still be an issue is the seat switch. It has 4 contacts so I assume there are two switches or one normally closed and one normally open that changes state with the operator sitting down. It does recognize if I get out of the seat (running in neutral with parking break off - if I get up the alarm goes off)

If I turn the key on and measure the voltage of the fuel shut off wire disconnected there is 12 V. But if I plug it onto the solenoid it drops to 0.2 V.

I suspect the operator module (fuel control module) but it sure would be nice to confirm the wiring before I invest in a 70$ module.

I've wired a bypass switch in so I can use the tractor but want to fix the problem.

Thanks for any help.

Paul

 

[WanaBFarmer]

I thought I would post an update.
Thanks to some help from Stillplayswithtractors I got it solved.

Buried in behind the instrument panel (lower left) there are 3 relays. One of them is for the fuel shut off and had gone bad.
The relay must have been working intermittently and then quit completely.
Swapped the relay for one of the other 3 and the tractor fired right up.

To help in the future I have"
- wired in a glow plug LED that shows if the plug bus bar is getting power
- wired in a fuel shut off bypass switch. It feeds directly from the battery to the fuel shutoff.

The fuel shut off switch allows me to run the tractor if any of the safety switches or relays go bad.
It also has an indicator light that shows if the output has power. Therefore it shows if the fuel shutoff relay is getting power normally because the output of the switch is attached to the fuel shutoff.

I added an inexpensive voltmeter too so I can keep an eye on the battery and alternator