#alternator
7 posts in Car Diagnostics blog about "alternator" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Dashboard lights flickering: earth, alternator or module
Flickering instruments are a supply problem until proven otherwise, and the cheapest possible cause is the one to check first.
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Battery light on while driving: how long you have left
The red battery lamp does not mean the battery. It means charging has stopped, and you are now running the whole car from a reserve that is measured in minutes.
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Headlights dim at idle: charging system or ground fault
Lights that brighten when you rev are telling you the alternator cannot meet demand at low speed. Whether that is the alternator, the belt or a bad ground is decided by one measurement.
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The auxiliary belt: squeal, cracks, and why a snap stops the car
The accessory belt drives the alternator, water pump, and steering. The wear signs and what happens the moment it snaps.
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Alternator not charging: diagnose before replacing, not after
A battery light does not always mean a dead alternator. What the voltages should be, why the belt and terminals come first, and how modern smart charging confuses the picture.
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Battery and alternator via OBD-II: P0562, P0620, diagnose in 5 minutes
What OBD-II says about the battery and alternator: codes P0562 (low voltage), P0563 (high), P0620 (alternator). How to read system voltage and why "overcharge" is more dangerous than "undercharge".
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Car Battery Warning Lights: What the Dashboard Battery Symbol Means
Complete guide to car battery and charging system warning lights: what the red battery symbol means, the difference between red and amber indicators, and how to diagnose charging faults before they leave you stranded.