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Idle drops when headlights turned on


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Hey guys, so recently I've noticed that when I turn my headlights on or use the electric windows at idle the car drops around 200 - 300 revs and feels like its getting close to the point where it might cut out or stall. I've also noticed that all of the interior lights such as the dash clock go really dim when the headlights are turned on and stay dim while I'm driving also.



I've recently had a new battery fitted and the alternator was tested and is in good shape, has anyone got any idea what could be causing this?




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Have you checked your earths and also the battery terminals?



I had the same issue and found that there was a loose cable on the positive and also on the negative terminals, tightened them down and problem went away.


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