I have both versions of the Schumacher maintainers as described by JDemaris. I got them both at WalMart for about $21 each. The automatic detecting version is evidently a newer version that replaced the one with the switch. Either one works fine. I also have the one from Harbor Freight that is occasionally on sale real cheap (and can be found other places not cheap). The Schumacher is US made and was designed by somebody with some intelligence. The other one is made in China and the LED lights up if it is connected to EITHER the battery or the outlet. There is no way to confirm that you really have good connections and it is doing any good.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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