</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by Howard Neil:
<strong>I have just taken delivery of a 1999 LWB Trooper Citation 3.0 Diesel. It has two identical 12V batteries fitted.

The dealer's answer as to why, was that it helps to turn the engine over on cold mornings.

Can anyone please give me a more technical answer as to why it has two batteries, please?
(UK)</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Diesels run extremely high compression ratios. Ballpark 20:1. It takes a lot of juice to turn over a motor with that much compression, hence, the two batteries.

--Dan