I seem to have a problem with the electronics on my 2006 Sundeck 270. My son was using the boat at our home in Southwest Florida when he reported that the radio, depthfinder, dashboard-installed GPS all "died" on a recent trip. The boat ran fine coming back to port, and after checking all the circuit breakers in the cabin and replacing a fuse in the battery compartment, he still couldn't solve the problem. Both batteries appear to be fine. Any ideas?