Standard Ignition Fuel Injection Relay,Fuel Pump Relay,Ignition Relay,Main Relay P/N:RY-158

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 (also RY158).