Positive to positive and negative to negative is exactly right. If you connect positive to negative (batteries in series) you will set up a 12 Volt system with two 6 Volt batteries. If you make the grievous mistake of connecting a 12 Volt battery to a 6 Volt battery nothing will work out. In series, you will create an 18 Volt system. In parallel, you may well cause an explosion in the 6 Volt battery. If you have a 12 Volt tractor, which uses two 6 Volt batteries, you can start your 6 Volt machine by connecting up to ONE of the batteries on the 12 Volt tractor. No harm will result. Remember, when jump starting, always connect in Parallel! Either vehicle can be negative or positive to ground and it won't make any difference to the jump starting procedure. I have jump started a VW Beetle with the Farmall M.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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