I took a 50 mile trip this weekend and on the way I watched my starboard voltmeter start fluctuating but not low it was going higher than usual and dipping back to normal. When I reached my destination I shifted to neutral and then back into forward. The EDC started flashing and there was no shifting. I had no time to check the diagnosis button as I was in a marina. I turned the engine off and back on again and shifted perfectly. Is my alternator going bad? Can voltage issues cause EDC shifting issues? Thanks for the responses.