Parts Cross-Reference
Superseded Part Number Meaning: What Replaced Your Part
A superseded number points to a newer one, not a dead end. Why it happens, when the new part is not a drop-in, and how to trace it.
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Car Seats & Child Safety
Weight Car Seat Age Chart: Limits by Stage, Not Birthday
Car seat age and weight chart from AAP, NHTSA and CDC: weight limits by seat type, when to move up, the 65 lb LATCH rule, and 2023 crash data by age.
Part Numbers
How to Read Exploded Parts Diagram Callouts and Rows
How to read exploded parts diagram callouts, quantities and remarks so the part you order is the one on your car. No dealer login needed.
Parts Cross-Reference
Parts You Should Not Interchange (Even If They Fit)
The parts you should not interchange on a cross-reference alone, from air bags to fuses, why a matching fit proves nothing, and what to check instead.
Battery Charts
Battery Group Size Explained: What the Code Describes
Battery group size explained with BCI's own chart: what the number and letters fix (size, terminals, hold-down) and why it tells you little about power.
Battery Charts
Can I Replace Flooded Battery With AGM? What the Car Expects
Can I replace flooded battery with AGM? See which swaps battery makers allow, which they rule out, and how to check what your car was built for.
Battery Charts
CCA vs RC vs Ah Battery Ratings: Which Number Matters
CCA vs RC vs Ah battery ratings explained: what each test measures, why CA is not CCA, and which number to compare on for your car.
Bulbs, Fuses, Wiring & Electrical
Headlight Bulb Size Codes Explained: H11, 9005 and H7
Headlight bulb size codes explained: what H11, 9005 and H7 identify, why one bulb has two names, and where your car's own code is printed.
Battery Charts
Is a Higher CCA Battery Better? Why Bigger Isn't an Upgrade
Is a higher CCA battery better? Learn what extra cranking amps buy, what they cost in size, plate design and fit, and the one number to match.
Bulbs, Fuses, Wiring & Electrical
How to Read a Fuse Box Diagram and the Lid Legend
How to read fuse box diagram charts and lid legends: what the number, rating and component columns mean, and what the blank rows are telling you.
Bulbs, Fuses, Wiring & Electrical
LED Headlight Retrofit Halogen Housing: What Specs Miss
LED headlight retrofit halogen housing guide: why a matching base is not a matching beam, what US rules say, and the legal ways to get better light.
Bulbs, Fuses, Wiring & Electrical
Car Fuse Types Sizes Difference: Mini vs ATO vs Maxi
Car fuse types sizes difference explained: how Mini, Low-Profile Mini, ATO and Maxi blade fuses compare, and how to tell which format your fuse box takes.