Holley RetroBright H820 • two-adapter set
Correct a non-standard H4 pinout after testing
The Holley H820 package contains two adapters and a wiring-conversion guide for non-standard H4 pinouts. The ceramic three-wire adapters use H4 male/female connections and can replace old or brittle sockets when the circuits are identified correctly.
Package
Two H820 adapters plus the wiring-conversion guide.
Connector design
H4 male/female, ceramic and three-wire configuration.
Circuit-specific assembly
The included RBEC120 male plug is assembled after the vehicle pinout is identified.
Before installation
Identify the wiring arrangement first
Test the circuits
Use a circuit tester or multimeter to identify the actual terminals; do not rely on factory wire colours.
Use the guide
Follow the included wiring-conversion guide for the pinout-swap process.
Check for switched ground
H820 is not the switched-ground solution. Holley directs switched-ground systems to a relay harness such as H840.
Installation resources
Manufacturer installation references
This guide covers assembling the H820 adapter and identifies the vehicle circuits to test first. Its type 2E1 procedure differs from the 1A1/2A1 adapter procedure. Check the actual headlight and vehicle connections; the lamp examples in this document are the original RetroBright versions.
Questions before ordering
Holley H820 adapter FAQ
How many adapters are included?
The offer contains two H820 adapters plus the wiring-conversion guide.
What does H820 change?
It adapts a non-standard H4 pinout after the vehicle’s actual circuits have been identified.
Can H820 replace an old H4 socket?
Yes, when the H4 wiring arrangement is suitable and the replacement is assembled to the identified pinout.
What plug and construction does it use?
Holley specifies a ceramic, three-wire H4 male/female configuration with an RBEC120 male plug.
Is H820 correct for switched-ground wiring?
No. Holley directs switched-ground systems to a relay harness such as H840.
Related RetroBright option
Check the headlight and adapter together
Review the Holley RetroBright 4×6 Hi/Lo headlight. Confirm the vehicle pinout and grounding method before selecting an adapter.
Warranty
Three-month limited coverage
This offer includes three months of limited coverage. Review the current terms and exclusions with the offer.
Compare the matching format
Browse 4×6 LED headlights. Match the lamp function and vehicle requirements before choosing an alternative.
