Powerboatr, I think that might be it. My charging wire from the coach was positive only, as the Focus battery negative terminal was already "grounded", but it's not, is it? The Focus and the coach have different grounds, separated by rubber tires. Because I am using magnetic lights, their ground is that of the coach, not the Focus! I'm going to try adding an additional negative connection from the coach connector to the Focus ground and see if the battery charges. Thanks!
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