14 volt tv and the inverter squealing.

I have a 12vDC tv which functions normally at 9.5vDc input, perhaps even less. Your 14v tv likely can be hooked directly to your 12vdc system bypassing inverter. Worth a try anyway.

My wagan elite 400 psw inverter failed a while back. Bummed.
If you are.plugging the wagan into through a ciggy plug, ciggy plugs are horrid electrical connections with ever increasing resistance until complete failure.