We have a 2013 Thor ace 30.1. We ran rca hook up from back of dash radio to main tv. The speaker under the slide works very well but the speaker closest to the tv has a hum and the sound is much quieter. Any ideas? when the radio is on all speakers work great.
I am not sure of the speaker wiring and placement in the Ace but one quick test you can also try is swap the rca wires either on the tv end or the radio end to rule out a bad wire connection (see if the muffled/humming speaker also swaps ... assuming I understood your problem correctly).