1974-1990 C3-C4 3-Pin Horn or Hatch Relay - 344813 - OEM Number(s) (344813)
1974–1990 C3–C4 Horn Relay – GM 344813 – 3-Terminal Electric Relay
Restore proper horn or hatch release function with this replacement relay, an exact electrical match for GM Part Number 344813, used across 1974–1990 Corvette applications. This 3-terminal relay fits multiple circuits including the horn relay on C3 Corvettes and the rear hatch release relay on early C4s.
Located above the fuse panel inside the driver-side footwell, this relay is often overlooked during troubleshooting—but plays a critical role in ensuring consistent signal delivery. Corrosion or failure can cause intermittent horn operation or inoperative rear hatch activation.
Features
• Fits 1974–1989 C3 horn relay circuit
• Fits 1984–1990 C4 rear hatch relay circuit
• OE-style 3-terminal design
• Replaces GM Part Number 344813
• Compatible with factory harness connectors
• Restores proper electrical switching for horn or hatch circuits
Dimensions and Weight
• GM Part Number: 344813
• Terminal Count: 3
• Mounting: Plugs into relay socket above fuse panel
• Application: Horn (C3), Hatch Release (C4)
Because Details Matter
When diagnosing inoperative horns or rear hatch releases, always test and inspect the relay. A failing unit can mimic wiring or switch issues. For best performance, clean the contacts and apply non-petroleum dielectric grease during installation to prevent corrosion and maintain reliable conductivity.
Under the Straw Hat – Restorer’s Insight
This relay may look generic, but its role is essential. 1974–1989 C3s use it as the horn relay; 1984–1990 C4s rely on it to activate the rear hatch. The footprint remained the same across both platforms, simplifying replacement but requiring proper diagnosis. Always confirm your socket is clean and that ground is present.
Also known under these part numbers: (For reference only)
- 00344813
- 036666002003
- 344813