#charging
9 posts in Car Diagnostics blog about "charging" — OBD-II diagnostics, DTC codes, repair. ← All posts
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The battery monitoring sensor: the small box that decides your charging
Clamped to the negative terminal, it measures every amp in and out. Ignore it when replacing a battery and the new one lives a much shorter life.
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P0560 to P0563: system voltage malfunction, unstable and high
Every module on the car runs on the same supply. When that supply misbehaves, you get a scattering of unrelated codes and one actual fault.
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Smart alternators: why your voltage swings and that is correct
Charging voltage that drops to 12.5 V under acceleration and jumps to 15 V on the overrun looks like a fault. On a modern car it is the design working.
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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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A phone in the car: mounts, charging, and why it overheats
A phone in a car lives in the worst thermal environment there is. Placement, charging, and why a cheap adapter heats and interferes.
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Replacing a battery: why a modern car needs it registered
On cars with energy management, an unregistered new battery lives far shorter. The procedure, choosing the type, and what resets when the terminal comes off.
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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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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.