That charger has an output fuse which may have blown out. The output fuse holder is located on the charger case end plate near the output cord. Sometimes the elements in these type of fuses blow out under their metal end cap so the fuse looks good but is actually blown out. For this reason, we recommend testing the fuse for continuity with a multimeter to confirm its condition.
Please let us know how it goes.
If there is an electronic components store in your area then they should also carry this fuse.