Near Intersection of I-35 & I-90 Southern Mn. | Asa you have observed, power is used to disengage the MFWD rather than engage it. So with the connector disconnected, the MFWD would always be engaged.
Sounds as if you removed the connector and checked for voltage with the MFWD switch in the off position. This should provide 12V to disengage. It seems that you only detect 10V. When you reconnect the connector, you do not detect any voltage.
If I were troubleshooting this, I would temporarily provide 12V and ground to the solenoid from another source using some decent size wires as the solenoid will require a fair amount of current. This should cause the MFWD solenoid to disengage.
If it doesn't, I would suspect the solenoid itself.
If it does disengage then I would suspect a problem with the switch or the wire leading to the solenoid. Rather than trying to track down a problem in a wiring loom, it might be easier to just add a new wire from the switch to the solenoid.
Edited by tedbear 12/13/2025 08:50
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jd 7730 mfwd issue
