Stumped

[rcardin]

Starting issue. I have a M8540 Cab tractor that will start if I remove the fuel solenoid. Fuel solenoid tested at the battery works as it’s supposed to. Read voltage at the plug and got 12.81 volts with the key in on position, voltage drops to 8 volts and then steadily drops when key is turned off.(battery tested at 12.89). Tested solenoid
With plug and grounding body and nothing. What am I missing.

 

[North Idaho Wolfman]

Do you have the WSM?
That should give you a better idea of how to troubleshoot it.

 

[rcardin]

I do not.

 

[JimDeL]

Does that model have a timer relay that activates the solenoid?