Battery light still flashes after replacing the wiring harness to the alternator

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I bought the car 7 months ago and replaced the alternator a week later. it worked fine for awhile but I noticed the dash lights going dim and then getting brighter. Battery light just started to come back on so I took it to a Ford dealer and they replaced the wiring harness to the alternator. that fixed it for about a week, now the battery light is flashing when I drive down the Road.