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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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