The black plugs into the bottom the red goes in the middle slot. as far as the plugs go, they don't have to be unplugged to test.
And as far as polarity goes, most of the time if you reverse the polarity on the tester plugs, it will just read negative.
Like if you put red to negative on the bat and black to pos... it will read something like -12.6VDC
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T.J.
Yerfdog Spiderbox, Uni Type air filter with 6" intake, 130 jet, Orange no-rev limit cdi, Red coil, iridium plug, 1500rpm clutch springs, 1500rpm contra spring, 13g sliders, 22" rears, 21" fronts, aftermarket reverse installed, and Trailtech Vapor.
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