Connect the cables to the good battery first- red on positive and black on negative and be careful to not let the clamps on the other end of the cable touch each other and spark. First connect the red clamp on the battery positive terminal, then connect the black clamp on the engine block. Start the car with the good battery first, then try to start the car with the weak battery. As soon as the weak car starts, take off the black clamp first, then the red one and take the other clamps off the other battery, being careful all the while that clamps do not touch each other and spark.
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