3430 crank / run issues

[TDN3430]

I have a New Holland 3430 that gives me trouble from time to time. Needs some help running this down.

Symptoms
At times it will crank fine and then in a few minutes die but crank again easily. It may do this 2 or 3 times.
At times it would continue to run even when key off. I had to pull the fuel stop solenoid wire to kill engine several times.
At times it will crank and run as long as the key is in crank position but the moment I release the key it would die.
All other times it works fine.

Work so far
Replaced fuel stop shut off solenoid - no change
Replaced ignition switch - no change
Replaced fuel filter and cleaned everything and bled fuel lines - no change

I have a I&T Shop Service FO-47 manual but it does not contain a wiring diagram to shows me what all is in the ignition circuit. I installed the new switch the same as the old switch however their is an extra wire connector at the switch but it was not connected and the blade showed no sign of it ever being connected.

 

[Roadworthy]

It appears to be electrical and related to the stop solenoid. Check voltages there when things are working properly and again when they're not. You could have a flaky fuse or an intermittent connection somewhere along the line. Look for signs of chewed wiring. Ask the dealer or mechanic if there are any known problems of this nature with this model.

 

[TDN3430]

Yeah the fuel shutoff was my first thought as well hence replacing the solenoid and cleaned all connectors. I did manage to have a meter on the solenoid wire this last weekend when it was acting up and I was able to confirm it had 12v with key on. I turned key to crank (12v) and when I let go of the key it died but the meter still read 12v at the solenoid connector. I am suspecting an intermittent wiring issue but have no clue where. All wires are bundled and hard to get to so inspecting without disassembling most of the tractor is hard.