At work I have a 2007 Citroen Relay3 LWB 35 2.2 HDI (120 bhp puma engine, the f***ing ford one!)
Lovely van to drive nicely matched engine and box (6 speed in this one) Very comfy and pretty good on fuel for its size.
It has a 2 year old battery which takes charge fine, alternator pushing out 14.4 volts consistently, but if left for a few days especially in the winter the battery will be deaddy dead, wont even flash then indicators on the plip, though dash lights will come on.
Are there any known issues that'll cause this? All instruments lights etc are functioning correctly, so not sure where to start.