Jurrasic, had a squiz at the 330 manual (much the same as the 320 I am led to believe), and it's much as someone said earlier. The bat for the o/head lighting, floor prox lighting, and exit sign lighting, will not charge unless all of the following are satisfied...
AC Bus 1 on
DC Shed ESS Bus on
EMER lt, No Smoking, both off,
etc..
p.s. who is SAMC? ..... maint. control??