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The fuse blew the first time I connected a trip cam. I used the fuse form the second unit and everything worked just fine, even riding my motorcycle through rain. I am guessing a bad / weak fuse and plan to carry spares. After all, they are meant to blow if you have a short.
The Black and Decker trickle charger has the standard plug, and jumper cables, but I like the plug...don't have to open hood, and I have 3 vehicles to keep charged in the winter. Almost the price of another charger but still good deal...also fused for safety.