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I am fixing up a tractor for my nephew, it's one of those generic tractors from the late 70's/early 80's. It has an 8 hp. b&s verticle shaft engine with internal altenator. The battery is putting out 12.7 volts, and the wire coming from the alt. is reading 13 to 14.4 volts depending on rpm. When i connect the wire to the positive side of the battery there is no change. when i turn the lights on it drops to 11 and below. Any ideas what i'm doing wrong. Thanks in advance.

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