YL-388-S 12V/30A 4-Pin Automotive DC Relay, 1 Pack Replacement for Fog Driving Light Wire Harness, Auxiliary Light Accessory Power Circuit Relay with Mounting Tab for 12V Vehicle Systems

Product Fact BlockPart/model: YL-388-S relay.Package: 1 relay.Electrical rating: 12V/30A as marked on the relay housing.Connector: 4 blade terminals.Mounting: molded tab with round mounting hole.Use case: 12V automotive electrical systems and fog, driving, auxiliary light, light bar, or accessory wiring harnesses that require the same YL-388-S relay style.Fitment ChecklistConfirm your existing relay or harness instructions call for YL-388-S or a matching 4-pin 12V/30A relay style.Match voltage, amp rating, terminal count, terminal orientation, socket shape, relay footprint, and mounting-tab position.Check the wiring-harness instructions, fuse box diagram, owner manual, or service manual before installation.Do not use this 4-pin relay to replace 5-pin relays, 87a changeover relays, or relays with a different current rating.Compatible Product CoverageThis relay is intended for 12V relay sockets and wiring harnesses that require the YL-388-S 4-pin 12V/30A style relay. It is commonly used with fog light, driving light, auxiliary light, light bar, and accessory power wiring harnesses when the socket layout and rating match. No specific vehicle year, make, model, engine, or trim fitment is claimed; verify by the relay marking and socket layout instead of vehicle model alone.Install NotesDisconnect battery power before servicing the relay circuit.Pull the current relay straight out; avoid prying hard against the fuse box or relay socket.Inspect the socket for heat damage, melted plastic, corrosion, moisture, or loose terminals.Install only when the relay rating, pin layout, and connector cavity shape match your application.Important NotesPart numbers and model names are used only for compatibility verification.If your current relay is marked 12V/40A or uses a different terminal diagram, choose the exact matching rating and layout.This relay may not correct issues caused by a failed switch, fuse, lamp, ground, wiring harness, or control module.Mini FAQWill it fit my vehicle? It may fit only if your relay socket or wiring harness calls for YL-388-S 12V/30A with the same 4-pin layout.Can it fix a light that will not turn on? It may help only when troubleshooting confirms relay failure; check the fuse, switch, lamp, ground, and wiring too.Is it a 5-pin relay? No. The supplied item is a 4-pin relay; do not use it for 5-pin relay sockets.

• [MODEL & SPEC CHECK] Includes 1 YL-388-S relay marked 12V/30A with 4 blade terminals, black plastic housing, and molded mounting tab. Match the model marking, 12V voltage, 30A rating, 4-pin blade layout, connector cavity shape, and relay footprint before ordering.
• [FOG LIGHT HARNESS USE] Intended for 12V automotive fog light, driving light, auxiliary light, light bar, and accessory wiring harnesses that call for the same YL-388-S 4-pin relay style. Circuit use depends on your harness or fuse box diagram.
• [4-PIN LAYOUT CHECK] Made for 4-pin relay sockets only. Do not use for 5-pin relays, changeover relays requiring an 87a terminal, or sockets with different blade spacing, orientation, locking shape, or current rating.
• [12V SYSTEM COMPATIBILITY] Compatible with 12V vehicle electrical systems and replacement wiring harnesses using a matching YL-388-S 12V/30A relay. No specific year, make, or model fitment is claimed; verify by the relay marking and socket layout.
• [MOUNTING TAB DESIGN] Integrated mounting tab with round hole helps secure the relay near an auxiliary light harness, relay panel, or protected mounting point. Keep the relay away from direct water splash, excessive heat, and loose wires.
• [REPLACEMENT DIAGNOSIS] May help restore circuit operation when testing confirms a failed, missing, overheated, or corroded relay. This relay does not guarantee repair of switch, fuse, lamp, ground, wiring, or control-module problems.
• [INSTALLATION NOTE] Disconnect battery power before service, pull the current relay straight out, inspect the socket for melted plastic, corrosion, moisture, or loose terminals, then install only after all specs and pin layout match.
• [COMPATIBILITY NOTE] Part numbers and model names are used only to help verify compatibility. Check your wiring-harness instructions, fuse box diagram, owner manual, or service manual before ordering.