Went to plug the ac adapter into the "C" cell with the plug and the plastic inside that holds the two terminals in place crumbled apart and seems to have shorted it out. Got the thing hooked up and reads votls in but measure on the cell outer terminals reads zero. Upon taking it apart, one terminal looks to have what looks like a diode and a round grey thing soldered from one side to the other, measured both sides still zero volts. My question is does anyone know what the components are, the value of them? Can't read anything on them. Hope someone can please help, tried search everywhere with no luck. Will try to pos a pic later, thanks.