Rywire Honda Main Relay Upgrade and Kill Switch Harness - OBD0, OBD1, OBD2 (RY-Relay-OBD0)

Rywire RY-Relay-OBD0 replaces the Honda main relay, a very common failure point, with a harness that runs a standard automotive-grade relay instead of the pricey, hard-to-find Honda part. It also adds a kill switch for extra security. Installation is plug and play.

Why This Honda Main Relay Upgrade Harness

The Rywire RY-Relay-OBD0 harness replaces the Honda main relay, a very common failure point, with a standard automotive-grade relay and adds an optional kill switch.

• Versus hunting down a Honda main relay: this Rywire relay harness runs a standard automotive relay instead of the pricey, hard-to-find Honda part.
• Versus splicing in a generic relay: this Rywire relay harness installs plug and play, with no cutting into the car wiring.
• Kill switch: this Rywire relay harness includes an optional isolation toggle switch for security; leave it disconnected if not wanted.

Best for: Hondas with a main relay: OBD0 version for pre-1992 cars, OBD1/2 version for 1992-and-later cars including OBD2.

Vehicle Fitment

• OBD0 version: early Honda vehicles before 1992
• OBD1/2 version: 1992-and-later Honda vehicles, including OBD2 cars

Features

• Uses a standard automotive relay in place of the Honda main relay
• Kill switch function for added security
• Isolation toggle switch is optional: connect it only if you want the kill switch feature
• Plug-and-play installation

Choosing Options

• Main Relay Type: OBD0 for pre-1992 cars; OBD1/2 for 1992 and later, including OBD2 cars.

What's Included

• Main relay upgrade and kill switch harness for the version you choose

Frequently Asked Questions

Which version do I need?

Early (pre-1992) vehicles use the OBD0 version. 1992 and newer vehicles use the OBD1 version, which also works on OBD2 vehicles.

Do I have to use the kill switch?

No. The isolation toggle switch is optional; disconnect or reconnect it depending on whether you want the kill switch feature. Email service@tunedbyshawn.com with your year and chassis before ordering if you are unsure which configuration you need.

Which Rywire main relay harness version fits my Honda?

Pre-1992 Hondas use the OBD0 version. 1992-and-later Hondas use the OBD1/2 version, which also fits OBD2 cars.