Ford NewHolland 3930 wiring

3930dave · Mar 11, 2016

All that said...... I've never looked at it closely enough to swear that the relay stays continuously engaged during Start. Meaning - it might be possible that the relay briefly drops out (opens) due to voltage dropping because of the starter load ? Esp. if the battery is weak....

Coming at it from another direction..... to what extent can you verify the solenoid itself is working ? Can you measure coil resistance to check for an Open coil ? If you force 12v onto the solenoid (via fused test lead), can you confirm that it is working ? If the output fuel line is accessible, can you verify fuel flow out of the solenoid under a forced ON test condition ?

Rgds, D.

theonlyiceman53 · Feb 11, 2018

First of all, thank you for the wiring diagram! I realize this is an older post but I hope someone is still around! I just got my 3930 a few weeks ago and it was hard to start and no dashboard indicators. The wiring diagram was invaluable to troubleshoot the issue!
Thank You!
Bill

dkocian · Aug 8, 2018

I echo the other sentiments. If you are still around, this was a big help. I have other books, but nothing showed the fuel shutoff relay.

Thanks!!!

Packratt · Jul 17, 2022

IisConfruzed said:
I couldn't find the wiring diagram for my NewHolland 3930 on line. Once I got it I thought I'd share. My fuel shutoff solenoid wasn't getting any power, and I couldn't locate any info- ended up a $13 fix. Here's the diagram, info page and the supplement they came from. View attachment 279889 View attachment 279890 View attachment 279891

Does anyone have the supplement this came from in PDF form. The manual I have is older than this supplement and the fuel solenoid is not present.