Once the engine is running, the alternator supplies power to everything electrical and recharges the battery. It is driven by the engine's accessory belt and controlled by a voltage regulator that keeps output steady. A failing alternator can look like a bad battery at first, because the battery slowly runs down with nothing replacing its charge.
That is why we test the whole charging system, not just one part, before recommending a replacement.
Signs of alternator trouble
- A battery or charging warning light on the dash
- Headlights or dash lights that dim or flicker, especially at idle
- A battery that keeps going dead, even after replacement
- Whining or grinding from the front of the engine
- A burning rubber or electrical smell
How we test and repair charging systems
We measure battery voltage with the engine off and running, test alternator output under load, check the voltage regulator, and inspect the drive belt, tensioner and wiring connections. A slipping belt or corroded ground can mimic a failing alternator.
If the alternator is at fault, we replace it with a quality unit and confirm correct charging voltage afterward. We will also check the battery, since a long stretch of undercharging can shorten its life.
Driving in Concord and Contra Costa County
Stop-and-go commuting with the A/C, lights and phone chargers running puts a heavy load on the charging system. Drivers who sit in traffic on the way out of Concord every day often notice charging problems first at idle.
Questions about alternator
Can I drive with a bad alternator?
Only a short distance. The car runs on battery power alone until the battery is drained, then it will stall. Call us and plan to have it checked right away.
Will a new battery fix an alternator problem?
No. A new battery will be drained the same way if the alternator is not charging.
Published by Anywhere Automotive, Concord, CA. Diagnosis and pricing are confirmed after inspection.