I'm having trouble getting the front speakers to work on my 1994 34' Diesel Pusher. I've replaced the deck but still no sound. Seems to me when I bought it last year I found a switch in a hidden location that I think controlled the speakers. For the life of me I can't recall where. Does anyone know where the switch might be located? or of any other issue that might be causing the problem. Hope someone can help. Thanks, JS