Had some cold starting issue this past few weeks, usually its been very good. A recent new battery didn't fix it so I checked the alternator and it was on the low side. Put a new on on (£50 off e-bay) and its transformed it. 2yr warrenty so its £50 well spent just to get a fully charged battery and decent lights for 2 years. I run the A127 75 amp one as I think they are better than the ACR and the same price. New alternator had a smaller pulley so it charges on idle. My Perkins has a huge starter so I go that off, took the brush cover off and used brake cleaner to clean the brushes and commentator, then penetrating oil, brushes were a bit stuck.. Spins a lot faster. Also cleaned and tightened all the battery leads and ends, they seem to work loose. All the things together have made a big difference.