I have a Peugeot Expert HDI 110 of the year 2005 and I stay the light of the fiery battery and sometimes turned off the battery and load well I also notice that the aerators and the air conditioning do not work when the light on and when it goes out rarely if the air conditioning works.
Once a similar problem was, the cause a fuse in poor condition. This fuse was asulfated and the loading light went out, and the calefa engine did not work. If that is not, it may be that your alternator does not load correctly.
It happened to me with a Ford Ranger the new alternator and yet it marked, the problem was also a Czech cut fuse that first if you do not check the alternator can have problems with the central fence where the coals are crowded, I also play this week a Peugeot 206 with that failure pledge abesses and others do not, the regulatory box is also an important factor.