Quote:
Originally Posted by wdfifteen
He is correct. The reason is that the final connection will probably make a spark and if it does you want the spark far away from the battery. All it takes is for the battery to be emitting some of its hydrogen gas and a spark. I had a battery explode in my face when I was using it to test a light bulb. I've also had a battery explode when jumping a car and the cables were on correctly. Again, hydrogen + spark.
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If the final connection could spark, that is why dr's sequence is backwards. Connect the black, or ground, last to the body and not near the battery.