I have an HDJ 80 with the 4.2 I6 turbodiesel 1HDT with a five speed. It is my understanding that this engine uses both batteries for start then reverts back to one for the rest of the electrical, correct? Here are my questions.... How does the second battery remained charged, is the alternator that powerful to charge it? I haven't looked that carefully, but I do not see wiring to the alternator on one of the batteries- unless I am not looking carefully, or overlooking it. In terms of diesels, the only knowledge base I have, is from a Rabbit/Golf diesel, where you had to pre-glow in the winter months I am from the North originally, and it gets damn cold. This is where you pulled the glow plug knob like a choke for you neophytes, turn the ignition on, waited for the light to go out and attempt to start. What is the procedure with this engine when it is cold? I don't see any glow plug light on the binnacle. Electrical accessories are 12v, i.e. cigarette lighter, lights? If I were to hardwire in an auxiliary fuse box, which battery should I run the power line to? How about lighting? In the same vein, when working on electrical, obviously one disconnects the negative cable, but should it be done on both batteries? Stupid question, but I felt it needed asking. Lastly at least for now, how does it start so damn quick? I mean, an 1/8th if that turn of the key, and it is started. My Jeep's no mocking here starter spins for about half to 3/4 of a second and starts. A year and a half old battery in that and four year old starter. That's all currently.... PROST!