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Like the water pump, the old generator was packed with wasps' nests. But after chipping out the mud with a screwdriver and turning the generator by hand until all the chunks and dust quit falling out, we took the unit to be tested. At first, it didn't charge, but then the tech polarized the generator by momentarily connecting the unit's two terminals with a jumper wire while it was running on his tester. Surprise: It worked perfectly.