There is no real reason to leave them connected. They will not stand the strain of the connection to the 6v for long. Resisting to lower volts is cool, but only to top them up. A maintainer is electronically set to just put in enough to compensate for internal self discharge. Using the units on 12v batteries is OK, but I don't think it is good for a maintainer. Put it on a fully charged 12v battery, and see if it puts out more than 13volts. If so, it will charge, but might not be appropriate to leave on for months. JimN
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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