For the up grade on my electronics last season new tridata and transducers needed to talk to the new Garmin 943xsv. After getting all the adapter, backbones to get everything talking it wasn't working. No depth or speed on the Garmin. So after checking over everything I call Raymarine. The tech asked did I put the blue plugs in each end of the backbone. I kind of boneheaded that little step . The whole thing about the backbone needing the resistor caps to work slipped my mind. I told him he was a genius and ask him if he wanted to help me put my dash back together also but he declined on that one. All that's left to do is mount the radar dome pull a cable in and that project will be a wrap.