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2

I took it to a main dealer who diagnosed that the battery needed a replacement. Now a quick test with the blowers doesn't seem to show any voltage loss as before.


6

There won't be a fault with the windscreen. If it was drawing excessive current, then the fuse for this circuit would blow. There could possibly be a fault with you alternator, in that it is not able to provide the current being drawn by the windscreen, this will then cause the battery to discharge. Another possibility is that the idle speed control valve ...



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