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.
Guides
Beginner · short stepsExpert · spec · code · mm
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How-to · Battery · Jump, test, alternator
DIY-safe driveway job
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.
Safety
Steps · beginner-friendly
Tools
Parts
ChrisFix
How to Test and Replace a Bad Car Battery (COMPLETE Ultimate Guide)
ChrisFix tests first, then replaces — so you do not throw a good battery at a bad alternator.
Watch on YouTubeIf you are not DIY · say this instead
I want a battery that matches the OEM group size and CCA. Keep the core credit on the RO.
Ask at the shop
Ask group size, CCA, and warranty months. “Top of the line” is not a spec.
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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
Test the alternator before you buy one
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.
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 · battery