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Years ago when everyone started winding for "high output", brushes and brushholders actually burnt on some units! Stage 2 was heavier brushholders and then bearings died... In RVs where the alternator has to work really hard the big alternators that survive are physically big, big bearings, big brushes, lotsa air circulation, and big dollars! If you use a winch or even just have a lot of aux lights you might find that a stock alternator lasts longer than aftermarket "high output" units, unless you pony the real money and get a good one. (I'm not saying this "mr alternator" unit isn't any good, I've never heard of them.)
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