I'd agree that it most likely sounds like a bad conductor somewhere, but you might also want to check your main ground connections on the battery and between the engine and chassis. If the engine/chassis ground was broken, the alternator output would have no common ground with the battery and therefore no charging.

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown