I have a 1984 S2 9.2A. Since winter storage, my power system has become flaky. I haven't had any problems with the starter engine, but sometimes the power to the instrument panel, radio and lights disappears.In a few cases, power loss and reappearance seemed random, but I have also experienced that I lost power when switching on the engine, as well as a case of regaining power when switching on the engine. The weirdest experience was when, with the engine off(!), I put the gear shift in reverse and suddenly radio and instruments started working again.Does anyone have any idea what could be causing this? Or, does anyone have a wiring diagram of the boat that I could copy?Thanks in advance