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We have a 77 Marinette Sedan Bridge with two gas engines. Recently an electrical fault developed where, after switching the ignition keys on, only the starboard starter will come on when engaging the ignition switch, with the port starter switch not engaging at all. At the same time, the blower, radio, and other electronics are no longer getting power. For some reason, all these things will receive power when we depress an unlabeled push button on the helm, though this push button previously didn't appear to do anything that we knew of (we've only used our boat for enjoying the marina, unfortunately). The push button has to be held in though, so it doesn't work for running the blower or anything else for that matter.
Any ideas what could have gone wrong? It appears to be an electrical fault. It showed up after I'd left the ignition keys switched on for a few days by accident, it may have rained during that time. I've checked fuses and breakers and nothing appears off that I can tell.