There are times when I halfway believe that machinery can be possessed by evil spirits. Here are some examples:
-I once ran a combine that in one particular field, all the safety buzzers and lights would come on and then go off for no obvious reason on every pass through the field.
-One fall within a week's time several customers complained that every time their grain tank got nearly full, their feederhouse/headers would shut off. The machinery could be re-engaged, but it was a hassle to unplug the head.
-Another combine seemed to dislike the son of the father/son partnership that owned it. It would run fine all day for the dad, but as soon as the son crawled in the cab at night all sorts of malfunctions and misbehaviors erupted.
While each of those situations tempted me to contact an exorcist, the cure was eventually determined to be purely of this world.
The combine that had the warning lights and buzzers turn on and off only is certain parts of a specific field? Years later I had reason to see a map that showed the flight paths of a regional airport 15 miles from the field where the system always went berserk. The powerful high-frequency radio "beam" that guided airplanes the the airport's main runway cut across that field in perfect alignment with the area where the combine's systems acted up.
The neighbors that had combines that would shut off the feederhouse when the grain tank was nearly full…? Well, they had all gone together and got a package deal on "power microphones" for their CB radios. Every time they keyed those self-amplified mikes to call for their grain cart to catch a load, it scrambled circuitry in the armrest circuit board and killed the feederhouse. Simply moving the microphones away from the armrest cured the problem.
And the combine that worked well for the father but refused to behave for the son…? The father was a technophobe and mandated that all the seat settings (height, front to rear, air ride, etc.) never be changed from what was comfortable for him. The son weighed about 70 pounds more than his dad, and when he got in the seat it sank low enough so that the seat mechanism had bounced around and bared wires that then shorted out, back-fed through the cab's circuitry, and caused all sorts of headaches.
I'm sure there's a similar explanation for the voodoo evil spirits I'm currently chasing in a tractor's wiring system, but as of quitting time today--I was about ready to sacrifice a chicken.