Are you charging the pack in the transmitter? Check the size of the pin in the tranny charge plug and the hole on the charger connector. Although the outside may fit (normally 5.5mm) there are 2 inner options (2.1mm + 2.5mm) so if you have a small pin and a big hole it won't make contact. If that is the case you can 'pack out' the 2.5mm connector with a few stands of wire to check connection.
For the 12V input, check the fuse. Sorry if I'm being obvioue but most dual power chargers only fuse the 12V input as they rely on the protection in the 240V PSU to protect against an problems.
Hope this helps,
Ian
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