When it comes to charging deep cycle batteries from an automotive alternator - there IS no cheap way to do it correctly - that I know of.
There are "battery to battery" chargers made for that specific purpose but they are very pricey. Used mostly for marine use. The charger hooks to the starting battery - and converts that into a voltage and charge sequence that goes to the RV battery (or battery bank). Basically - it's just a 12 volt deep-cycle battery charger with a 12 VDC input instead of 120 VAC. Last one I looked at was over $400 and not worth it for an RV with a few deep cycle batteries.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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