RV's are set up to charge the coach or trailer battery through a relay that disconnects the second battery when the engine is not running. The idea is to connect the second battery in parallel with the vehicle battery when the engine is running and the alternator is available to provide charging current, and then disconnect it when the engine is not running so that loads on the auxillary battery don't discharge the vehicle battery.
Any RV supply place can sell you the necessary components along with the instructions on how to wire it.
The battery isolation relays look very similar to an older starter selenoid, but are intended for continuous use rather than the intermittant use that a starter selenoid gets.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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