Ask a simple question and get bashed for using your outside speakers. Gotta love this forum. For you that question he outside speakers you might want to try camping somewhere other then a tiny campground where your neighbour is five feet away. No really. Try it.
As for the OP try adjusting the fader settings. But to me it sounds like they didn't wire it correctly. I have three switches on mine. One for the inside speakers, sub and the third is for the outside speakers. I do have a different trailer, but they should all work similar.
