As we do it in Norway: You will get far with the large 6V battery standard in old M-F or possibly Volvo tractors (which used 2x6V batteries), one of very few 6V still available at Biltema (large Swedish discount store for everything mechanical) and new oversize cables (mine are around 1 cm in diametre). That battery comes in periodic black, is around 200Ah and fits the C-300 with a new hold down on top. I have tried the 6V/12V variety which worked but was expensive and unavailable outside the US. Likewise the 8V stuff I reckon. Have not yet seen any 6V jump starting device, but am looking for it too. And then hardcore variety when the Hemi is hot and possible with vapour lock: Pouring gasoline in carbs does help, if not: Jump start the car with a 12V diesel battery and heavyweight jumper cables. To avoid melt down of battery terminals and too much flying sparks it is possible to split the Chrysler original negative wiring, and connect the main starter wire outside the normal circuit with the neg from 12V (avoiding ground!), and then the thinner stuff as original to the 6V neg terminal. Connect all pos wires including starter relay and 12V to your pos 6V terminal, sit in and use the key for comfortable high RPM cranking without any hazard to other equipment than the 6V starter (which I believe it was George Riehl who once told is about bulletproof, and just as the one found in old VWs can be used for years in a 12V system). Roadside without this splitting of wires it is always adviceable to have a helping hand waiting with the 12V neg supply, and not making the final circuit connection until after you engage the original system to reduce the number of flying sparks. Also have to give you the story from when I bought my C-300, and asked the vendor if there was any special procedure when starting it. His reply: "Nothing special, just crank for a minute, then wait a bit and crank for another minute. Repeat as necessary". Maybe no surprise that the first items I bought for my car was a spare 12V battery and jumper cables. Narve N NORWAY Chryslers 29-31-40-52-54-55, in other words frequently coping with 6V pos ground -----Opprinnelig melding----- Fra: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx]Pa vegne av Johan Vastsater Sendt: 21. november 2006 17:38 Til: Chrysler300@xxxxxxxxxxxxxxx Emne: [Chrysler300] 6V Jump Starter Hi all in 300 land, My C300 sometimes cranks pretty slow on the starter and is hard to start. No doubt why they changed to 12V for '56. In pictures of other club members C300's I can see some have 8V batteries. Anybody having good experience from these? I have been looking for a 6V Jump Starter to have in the car as a backup when going on trips but I can not find any other than 12 or 24V. Is there someone out there who knows where to find one for 6 volt? Thanks! Johan Vastsater Sweden C300 (6V) Opel Kapitan '59 (6V) [Non-text portions of this message have been removed]