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Hi my name is Robert....
This is a difficult one with out a wiring diagram... To start on this I would be checking your cables from the disconnect solenoid to the battery, make sure the cables are clean and tight and that the cable is not resting on the frame or has caught a screw. Have seen an issue once before where the cable was routed on the frame and the cable would rub or vibrate from driving and catch a screw, over time it would cause a short and cause the solenoid to fail. I would also have the batteries load tested to make sure they are good, if the batteries were in poor condition OR one had a shorted cell it would be an issue. Most auto parts stores can load test them for free... Hope this helps some, IF you have more questions or concerns please feel free to contact me.... Robert