Ford Transit - Ford Transit electrical problems - den1960

My internal lights only work when ignition key is in and turned to 11 ... also, when i am at a standstill and the engine isnt running everything turns off after about 30 seconds ... do i have major problems?

Ford Transit - Ford Transit electrical problems - elekie&a/c doctor
You probably have 2 batteries under the driver seat.one of them is likely to be flat