Sears makes a "Battery Tender" for $16.00. It does have a switch for 12V and 6V. I glued a small piece of plastic into the switch so that it cannot inadvertantly be switched to 6V. It worked flawlessly all last winter. I bought a second one and hooked it up to my Suburban (which has two batteries because it is a diesel) and it worked fine in that application. The Sears unit is fully automatic, just like the Battery Tender--and a lot less expensive. I don`t drive the Suburban in the snow because it is a rear wheel drive unit.
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