I have a c161 that has not been started for two weeks. Today I tried to start it would not turn over as if not enough battery power. I hooked up a jumper to the battery and it started but ran for less than 30 seconds before stopping. It was blowing smoke like it was running rich. When I tried to start again I had no electrical power, no lights, no starter action. After a few minutes passed I had lights again and the engine would crank but would not keep running as before. I cleaned the carb to solve any rich running issues, but I am puzzled about the loss of electrical current. I connected a multi-meter to the battery and it showed 12 volts. I decided to remove the battery and put it in a charger for awhile anyway. Could the problem be with the rectifier?