In most cases, the 7443 automotive bulb is replaced by the 7440 in catalogs and stores, but you should verify the socket and wattage for your vehicle.
Understanding the 7443 bulb
The 7443 is a 12-volt automotive bulb with dual filaments, designed for applications such as tail lights and stop/turn signals. It fits a bayonet-style base and carries two separate lighting circuits in a single bulb. Depending on the market, similar bulbs may be sold under different numbers, but the key compatibility factors are the base type, voltage, and wattage rather than the color or finish alone.
Common equivalents
For replacements, the most frequently cited cross-reference is 7440, which is marketed as the closest substitute in many brands. Availability varies by region and manufacturer, so always double-check part numbers on the packaging and in the vehicle manual.
- 7440 — widely used as the closest cross-reference in many catalogs
The list above reflects the standard cross-reference most drivers see when shopping for a direct swap. Other numbers may exist in regional catalogs or for specific functions; always confirm before purchasing.
How to confirm compatibility
Before buying a replacement, confirm that the new bulb will fit your vehicle's socket and operate the intended circuits. Use these steps as a quick checklist:
- Check the vehicle's owner manual or the original bulb's packaging for the exact replacement numbers and wattages.
- Compare the bulb base shape and size with the socket to ensure it seats properly (some 7443 replacements are dual-filament, others are not).
- Verify voltage (most automotive bulbs are 12 volts) and the wattage for each filament to avoid overloading circuits.
- Inspect the filament arrangement: ensure the replacement has two filaments in the same arrangement if your original is dual-filament.
- If ordering online or from a parts store, use the vehicle's make/model/year with cross-reference tools to confirm compatibility.
If in doubt, consult the retailer or the vehicle's dealer to avoid mismatches.
Summary
The 7440 bulb is the most common equivalent for 7443 in many markets, but compatibility depends on the socket, dual-filament requirement, and wattage. Always verify with packaging, manuals, or manufacturer cross-reference guides before purchasing.