When you replaced the solenoid, did you also replace that relay that is shown in the picture you posted?I installed the new solenoid, and the problem continues.
Are these what you are talking about. As we were checking the wires we found a lose connection on this bad boy.auto reset breaker in your 12 volt supply line that is tripping
When I searched the part number it was sold as an entire unit, so everything in the picture is brand new.When you replaced the solenoid, did you also replace that relay that is shown in the picture you posted?
If you did not, I would tend to suspect that it would be the cause of your problems, assuming that it comes from this solenoid. Are the 2 fuses that can be seen at the bottom(lower right of this picture) a part of the solenoid and replaced with it?
Have you determined exactly what this solenoid is and what it does? If in the battery box next to the battery then I would suspect it may be a battery isolator. An easy way to eliminate that device would be to put both the lead from the battery and the one from this device on to the same terminal, which would have the same results as the solenoid being closed all of the time.
Have you been able to measure voltage on either side of the solenoid while the 12V is missing from the RV? If not, as soon as the problem happens again, measure to see if it is passing through. Measure from first one terminal to ground or to the battery negative post and then the same from the other terminal.
Read the printing on the side of the auto reset CB in the second pic above, it says SHORTSTOP. Is that what you are talking about?Finally there is the "Short Stop" Current through the bi-metal strips trips it but then there is a finer high resistance wire wrapped around the bi-metal strip that continues to heat it (at much lower current) till you stop the current either by turning it off or removing the load... One of those drove me crazy for a while till I figured it out. I doubt you have that type.
It might be, not sure.. I think they use the Short-Stop label on multiple types..Read the printing on the side of the auto reset CB in the second pic above, it says SHORTSTOP. Is that what you are talking about?
If they are designed to do the same thing, why would there two of them?