First of all be aware if two are connected in parallel and one is bad it can draw off the good one. It's best when two batteries are connected they be IDENTICAL the same age and brand and type and size and rating. Its cheap (free usually) to have a battery shop do a load test to insure you don't have one bad battery sucking down the other, you may want to do that. At least check electrolyte and voltages of both batteries first. A "good" full charged 12 volt battery should read around 12.6 volts once stabilized and at rest.
While it will "work" if the two are connected in parallel, if you simply place the chargers + and - to the + and - of ONLY ONE of the two batteries, ITS MUCH BETTER IF YOU HOOK THE CHARGERS + TO THE + OF ONE BATTERY AND THE CHARGERS - TO THE - OF THE OTHER BATTERY. Yes Billy Bob and Bubba I know either way still works !!!!!!!!!!!!
If you want to understand why the above is better, read through Smart Gauges research, you may not believe how much difference it can make as far as better balancing for charging and load currents. When us RV owners wire up several RV batteries this becomes more important so they all receive more equal charging and load currents
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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