So I have been experiencing the same battery drain issue with my Thor Synergy on a Mercedes Sprinter chassis. The local Mercedes dealer service department couldn't find the source of the drain, nor did they mention the battery cable disconnect located above the foot pedal. I suspected the source of the drain might be the Axxerra radio, confirmed by some threads on this web site. So I called Axxera radio tech guy just confirmed that the radio which Thor installed does in fact drain the battery even when appearing to be "off." He suggested I install a toggle power switch connected to the red wire located behind the radio. He said I could easily remove the radio by prying off the border trim, then sliding some knives down the sides to release the clips. Then cutting the red wire and installing the switch, locating this switch to somewhere handy. Inside the cigarrete tray? I haven't tried this yet. Has anyone else? News to follow.
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