it may or may not be obvious, but keep your car/truck running when you attach the cables. Make the last connection to a ground away from the battery. (In rare cases, a battery may have produced hydrogen gas which could explode if you create a spark near the battery). Also, make sure you connect the negative to the true negative of the trailer battery. I haven't checked mine recently, but I heard that the black on the trailer battery may be the 12V using the color convention of AC wiring, and white on the ground.
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