Solutions
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Brent's post in A2A C172 and lights was marked as the answerJust to close the loop on this thread...I checked my FSUIPC Miscellaneous tab and found that the "extend battery life indefinitely" had been selected (I was sure I had disabled that option but... :blush: ).
After doing that all lights work as they should when the battery is on/off....at least in FSX DX10!
Regards
Brent