Owner's book · not a shop
Open HoodKnow the car. Then the window. Factory specs in plain English — don't authorize until you can say this at the counter.
Owner's book · not a shop
Open HoodKnow the car. Then the window. Factory specs in plain English — don't authorize until you can say this at the counter.
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How-to · Battery · Jump, test, alternator
DIY-safe driveway job
The alternator is the engine-driven charger. Engine running, you should see roughly 13.8–14.7 volts at the battery. If headlights dim and voltage sits at 12.2 while running, the alternator (or a cable) is the suspect — after you proved the battery.
Safety
Steps · beginner-friendly
Tools
Parts
No parts to buy first.
ChrisFix
How to Test an Alternator
ChrisFix puts a load on the charging system and shows the voltage window a $20 meter can prove.
Watch on YouTubeIf you are not DIY · say this instead
Please measure charging voltage at idle and at 2,000 RPM with loads on. I will not authorize an alternator from the battery light alone.
Ask at the shop
Ask for the running voltage number. A battery light can be a belt, a ground, or the regulator.
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Battery
Test the 12-volt battery with a $20 meter
A healthy rested battery reads about 12.6 volts. While cranking it should not crash below about 10 volts. That $20 multimeter is the difference between buying a battery and buying an alternator you did not need.
Battery
Jump-start a dead 12-volt battery
A dead battery is usually lights left on or an old battery — not a dead engine. Cable order matters so you do not spark on the battery. Last clamp goes to bare metal on the dead car, not the dead negative post.
Battery
Replace a 12-volt battery
Negative cable off first, then positive, then the hold-down. The new battery must match group size and CCA, not just “it fits in the tray.” Positive on first, negative last. Many radios will want a code. Recycle the old one — the core is worth money.
EV
EV 12-volt battery: the little one that bricks the car
The big pack moves the car. The little 12-volt battery wakes the computers, locks, and contactors. When it dies, a “full” EV will not unlock or charge. You jump the 12V posts in the manual — never the orange cables. Replacement is a normal battery job in a weird location.
Parts · alternator · battery