Your car battery has two connections called posts. one is negative and one is positive +. the red clamp from your charger goes to the positive terminal on the battery. the black clamp is supposed to go to ground, like an unpainted bolt but not brake lines or any kind of tube. It can be hooked to the negative or black battery connection as well. just make sure there is plenty of airflow around the battery and you should be fine. I usually do it that way and have never had a problem.. finally set your charger for 10 amps on a 12 volt battery and plug it in.
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