Ian it makes no difference if you have one 12V battery or two 6V batteries as the two 6V batteries will be wired in series to create one 12V. As on my Tilly here for instance which is a normal 12V vehicle. Back then it was common to have both 6V and 12V vehicles so 6V batteries were quite common.
The two cables in the plug will be for the pos and neg terminals on the battery.
Ron
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