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 - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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