if you have a multimeter...try to test it if it has an ouput...if you get a reading,,,check your connection with the battery ..you might have it loose connected...if you dont get a reading ...if you can open the charger, try get the output to the main board of the charger...if you get a reading maybe theres something wrong with your output wire ,,,test its continuity and replaced it or you can even cut it then resolder it to the main board ...if you dont get a reading ...just buy a new charger....