well its a fairly new heavy duty battery and a new alternator.
tinking its probly an wire loom which goes to the thermostat?
battery is a 14v tick over, and just over 14v at fast idle
more concerned about the starting issue at the moment which looks like it might be an injector fault but no one will comment about them...
as said before glow plugs appear to be working and the only way to get the car started is easy start or brake cleaner seems best
can someone please comment on this part aswell