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Message: <blockquote data-quote="macuser27" data-source="post: 1424293" data-attributes="member: 21874">I drove about 5 miles from home to O'Reilly's with the battery light coming on and off intermittently. Removed the battery and alternator from my car in their parking lot and brought them in and the tech hooked it up to the tester without charging it. He tested the battery, passed and then tested the alt and that passed. I asked him to test both again. Passed again. I was hoping that he would be compelled to have my parts fail so he can sell me replacements but that was not the case.So I went home and checked as much wiring as I can in the engine bay and it mostly looks good.Then I went under the car and checked the ground wire that connects the engine block to the frame and it was extremely rusty on the frame end. I disconnected that wire from the frame and started the car and it did not trigger the battery light. Weird.</blockquote>