Had a circuit at a concrete plant I used to work at doing something similar. The solenoid valve would work a few times, and then quit. Give it 30 minutes or so, and it would work a few times, and quit.
I finally figured out the wire was burnt into inside a piece of conduit running out to the silo. The conduit was u shaped, end to end, which allowed water to settle in the bottom of it. I guess there was just enough water for it to creep in and make the connection between the ends of the burnt wire. Once the valve was used a few time, the heat of resistance dried the water out. They quit using the gate, the area cooled, and the water crept back in. Things worked as normal a few times, and then quit again.....and so on, and so on.
Troubleshooting was a real PITA as the wire continually showed continuity when tested. I've run into similar situations before, so I assume there was just enough continuity to show on a meter, but not enough to allow the proper current flow to operate the solenoid valve. In the end I just pulled a new wire and every thing worked as it should.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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