Starts then cuts out, then it will start and cut out again, but if you put a jump pack on it fires up and keeps running

Looks like you discovered the Anything goes thread. Deffo took a wrong turn there :). That should really be called the Take the p1ss thread but now you have the right section you should get sensible answers. The 2010 is a bit newer than mine but...

I've just changed battery on my P38 as battery not holding charge was causing all sorts of electrical faults with different systems when running. Biggest powerfullest battery you can get and that will fit in battery tray recommended

No it still fires up and then cuts out again, Simon says it feels like it just doesn't have enough power the run all the systems

When we leave it with the smart charger over night, it doesn't happen and then we you put a jump pack on it, fires up and keeps running. It's a bit odd as it initially fires up and cuts out straight away

Trying a different thread as less than helpful comments on the general thread.... Hi Everyone, we have an L322 2010, tdv8 with an odd battery drain, press the start button fires up then instantly cuts out. Battery is good Alternator is charging...