Does anyone know where the fuse is between the solar controller and starter battery on a Carthago 138db. The twin solar controller is wired via the Carthago pre-wiring and was happily charging both leisure and starter batteries but is no longer connected to the starter battery. On the app battery 2 isn't there any more. I disconnected and tested the wires for battery 2 but there was zilch. The controller's panel battery 2 terminals showed 14.5v was available. I suspect a fuse has blown but can't find it and the owner's manual isn't helping. It's still under warranty, but if it's a fuse then I'd rather do it myself in case it happens again.