2002 Jackeroo diesel 2 Battery system

er........ not following you .... two batteries ... one battery..... jump on one ? More info ? TD Jacks can be such a bugger to start in cold conditions that you should not take any power from your main cranking battery when stopped. If you use a 700CCA main battery or better (not common but available) you should be ok in chilly conditions, IF you run the correct oil grade.

Understood - forgot re the two batteries after 2000 (mine had the one). Suggest you need to divorce the two batteries with a controller - lots of people do this - Rotronics/Piranha etc make them - available at all 4WD outlets - you may need it fitted by a pro - you start the engine from the main battery and run accessories from the other - the controller sends alternator power to the main first - when it is full, the charge goes on to the aux - or variations on that theme. As said, if the main is a 700CCA battery, you should be right for starting (Yuasa Overlander is one). The two batteries thing from Holden is their answer to a classic cock-up from Isuzu - its a great injection system, but cold thick oil it can't handle - two batteries and thin oil are their answer - Holden of course couldn't give to hoots about anyone's need for an aux battery and accessories etc.