On my Thor Four Winds, the camera selection for the side view/rear view is done by a separate unit, similar to
https://www.amazon.com/dp/B00OYGPVP0...v_ov_lig_dp_it
I replaced the receiver that came with it that failed with a new one. No problems so far. The new one doesn't have the features (no CD/DVD player) but we didn't use that much anyway. We are using our phones for music more and the new one interfaces well with our phones.
Thor Forums
