Keep fuel, ignition, and main power circuits switching reliably with the Standard Ignition Relay RY-158 — a direct-fit replacement for the 1985-1987 Honda Prelude. This single relay is cataloged under four names because it serves each of those circuits: it is listed as a Fuel Injection Relay, Fuel Pump Relay, Ignition Relay, and Main Relay.
A relay is an electrically operated switch: a low-current control signal energizes the coil, which closes the contacts and passes higher current through to the load. If a failed relay is the cause of a no-start, a fuel pump that won't prime, or intermittent stalling, this replaces it. Diagnose the circuit before replacing, since these symptoms can have other causes.
- Multi-function relay: supplies switched power for the fuel injection, fuel pump, ignition, and main circuits.
- How it works: the control-side coil switches the higher-current load contacts on and off.
- Direct-fit application: intended to replace the original relay on the listed vehicle.
- Signs it may need replacing: no-start, fuel pump not priming, or intermittent power loss — if the relay is at fault.
Manufacturer part number RY-158.
Frequently Asked Questions
What vehicle does the RY-158 relay fit?
It is a direct-fit replacement for the 1985-1987 Honda Prelude. Confirm fitment for your vehicle using the Buyer's Guide tab.
Why is this part listed under several names?
The same Standard Ignition RY-158 relay is cataloged as a Fuel Injection Relay, Fuel Pump Relay, Ignition Relay, and Main Relay because it switches power for those circuits.
What does this relay actually do?
It is an electrically operated switch: a low-current signal energizes its coil, closing the contacts to pass higher current to the load circuit.
What are signs this relay may need replacing?
A no-start, a fuel pump that won't prime, or intermittent stalling and power loss can point to a failed relay. Diagnose the circuit first, since other parts can cause these symptoms.
What is the manufacturer part number?
The manufacturer part number is RY-158 from Standard Ignition.
Write a Review