The check valve Gomers2 mentioned is to prevent backflow into the city water connection. Your description of a very similar problem in a previous RV is likely leading you to the cause in your T@B. Th… (View Post)
Measuring resting voltage will only tell the state of charge. It is not an indicator of capacity. An aging battery may still charge and discharge normally just with a lower capacity than when new. To… (View Post)
I had the same problem with the loss of height when I installed a wooden slat floor. I removed it and replaced it with a "loofah bath mat". It fit perfect, non-slip and excellent drainage w… (View Post)
I'd recommend a battery maintainer with a desulfation feature. This avoids running the converter for months just for a float voltage and provides some battery reconditioning in addition. (View Post)
The water pump draws relatively high current. If your battery is marginal it could easily pull the system voltage too low for the other loads to operate. When connected to shore power the converter h… (View Post)