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My car will start after I charge the battery but then it dies.I have replaced the battery and checked the altenator. Everything there is good. Someone told me it was a sensor or a relay. I cant seem to find where to look to check it. Which sensor or relay would it be and where do I need to look?
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you need to go back to the basics. first, disconnect the battery and clean all the connections. once the battery is fully charged, have it load tested. you would be shocked (no pun) how many brand new batteries are bad. after this, have the charging system tested--real world, while it's running and then see how many amps the alternator is putting out.