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All good advice. The wire in the lower right in the picture goes to the battery isolator. The heavy short lead goes to ground and the small red wire is live when the key is on. Alternator shop is a good thought. They seemed to think it was working fine based on the bench test. They even adjusted the voltage output slightly to 14V. Based on that i assume it has an internal voltage regulator. Any chance the drive on the engine is not turning? Seems unlikely.