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If the battery charger is the problem, there is not much you can do apart from checking the power cord and the internal glass fuse. If the cord delivers full power to the curcuit board, then remove the fuse and test it with a multimeter or an ohmmeter. If both is okay, I have no further advise then to replace it. Some times, it could be that the batteries are the ones to blame for a broken charger. Make sure your batteries are ok, so they do not destroy another charger. Check for capasity, excessive temperature when operating or charging, or strange smells indicating burnt components in the battery packs.
If you are comfortable with removing the upper half of the housing, unplug charger and remove the screws, take a look at the circiut board for a "cold" solder joint or broken component, usually the round ceramic looking piece with the copper wire around it. but look at the whole board.
your NG3 should have been preprogrammed for the type of batteries you are charging. The NG3 has the 3 wires from the power cord. Here is what I have done:
Brown from charger goes to black wire
Blue goes to white wire
yellow green goes to green ground.