X AUTOHAUX LED Bypass Flash Harness for Corvette C5 1997-2004 — Relay with TPA Connectors

The X AUTOHAUX C5HFH LED Bypass Flash Harness replaces the fast-flash problem on Corvette Envy C5 (1997–2004) taillights by using a relay and TPA connectors so LED signals flash correctly without added resistors.

Installing LED taillights on a Corvette C5 can trigger super-fast blink rates or erratic turn signals. The C5HFH bypass harness is built specifically to prevent hyperflash and restore normal turn-signal operation using an integrated relay and secure Terminal Position Assurance (TPA) connectors. This product is engineered for the U.S.-spec Corvette Envy C5 model years 1997 through 2004 and is not compatible with Euro-style taillights.

How does this harness stop the fast-flashing (hyperflash) after LED installation?

The harness adds an LED-compatible relay and wiring path that mimics the electrical load the vehicle expects, preventing the flasher circuit from interpreting LEDs as a burned-out bulb. Rather than adding inline resistors, the relay-based solution provides a direct, stable signal for the turn circuit.

• Integrated relay corrects pulse rate without loading circuits manually.
• Works by providing a stable electrical signature to the factory flasher.
• No need to install separate resistors or modify the vehicle's wiring.

Will this harness fit my Corvette C5?

This kit is designed for Chevrolet Corvette Envy C5 models from 1997 to 2004 and uses part number C5HFH. Confirm your car’s model year and taillight type before purchasing because the harness is not compatible with Euro taillight assemblies.

• Part number: C5HFH — matches U.S.-spec C5 Corvettes 1997–2004.
• Not compatible with Euro taillights—verify your fixture style.
• Check wiring diagrams or OEM plug shapes to confirm fitment.

What connectors and hardware come with the harness, and how secure are they?

The harness uses TPA (Terminal Position Assurance) connectors to keep each terminal locked and ensure reliable electrical contact. The package includes one tail light bypass flash harness; no extra resistors or relays are required beyond what’s integrated in the unit.

• TPA connectors lock terminals in place to avoid intermittent contact.
• Includes one complete C5HFH harness ready for plug-and-play installation.
• Relay integrated in harness for consistent performance under load.

How difficult is installation and what tools are recommended?

Replacement is typically straightforward for someone comfortable with basic automotive wiring and panel removal. The harness is designed for direct connection to the factory plugs; you’ll need small tools and a torx driver for convenient access.

• Recommended tools: T-10 x 4 Torx driver and a small flat screwdriver.
• Installation involves unplugging factory connectors and securing the harness with TPAs.
• Search online installation videos if you want step-by-step visual guidance.

Who this is for: The X AUTOHAUX C5HFH harness is for Corvette owners who upgraded to LED taillights and now experience fast or erratic turn signals, technicians who prefer a relay-based fix instead of adding resistors, and DIYers who want a direct-fit, secure connector solution for 1997–2004 U.S.-spec Corvette Envy C5 models. It’s not intended for vehicles with Euro taillight assemblies—confirm fitment before ordering.