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Intermittent lighting fault with an Alfa Giulietta

Occasionally, when trying to dip headlights, they do not dip but the indicators come on randomly, proving both embarrassing and dangerous. It is not caused by moving the stalk incorrectly. Our Alfa dealer has not encountered the issue and I just know it will not occur while at the garage!

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Random CAN bus wiring fault probably caused by a bad earth to the headlights or to the indicators.
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