Specs & use: SG158G electronic turn-signal flasher/relay module for turn signals & hazard flashers; commonly listed as 12V DC, 120W load rating, 3-terminal (3-pin) plug-in style. Designed for stable flashing and a direct replacement when the original flasher relay is weak or intermittent. OE/Part No: SG158G. Related reference: SG258G is commonly listed as the 24V version—match voltage before use.
Install notes (DIY-friendly): Disconnect the battery, find the flasher relay location in the junction box/fuse panel or relay block (many vehicles place it with other relays; exact position varies—use the owner's manual or fuse box cover diagram). Unplug the old unit, match the 3-pin layout/keys, then press the new relay in until fully seated. Do not force; confirm system voltage (12V) and pin orientation before powering on.
Compatible with 12V Vehicles SG158G Turn Signal / Hazard Flasher Socket Junction Box / Under-Dash Fuse Panel Relay (Confirm fitment by OE number SG158G & socket pin layout).
Compatible with 12V Cars Trucks SUVs Turn Signal Flasher Module 3-Pin 120W SG158G Fuse Box / Relay Block Relay (Confirm relay style and terminal arrangement before purchase).
Compatible with 12V UTV ATV Golf Cart Turn Signal / Hazard Blinker Flasher SG158G 3-Terminal Plug-In Unit Fuse Panel / Relay Panel Relay (Confirm fitment by manual/diagram).
Troubleshooting keywords: turn signal relay, flasher relay, blinker relay, hazard relay, electronic flasher module, 3 pin flasher, 12V 120W. If you recently installed LED bulbs and see fast/erratic flashing (hyperflash), verify the flasher type and load requirements before replacing parts.
Related checks (helps diagnosis): symptoms like no blink, solid-on, or irregular flashing can also be caused by blown fuses, poor ground, loose connector pins, damaged wiring, or a faulty turn-signal/multifunction switch. Verify those items before replacing parts; keeping a spare flasher relay in the glove box/tool kit can help with quick roadside swaps.
Description
This SG158G electronic flasher relay is a replacement turn-signal / hazard flasher module for 12V systems that use the SG158G 3-pin socket. It's intended to restore normal blinking behavior when the original relay becomes intermittent.
OE / Part Number: SG158G
System Voltage: 12V DC (confirm your vehicle's system voltage before ordering)
Rated Load: up to 120W (check your lighting load)
Terminals: 3-pin plug-in flasher relay/module
Function: turn signal relay / hazard flasher relay / blinker relay control
Turn signals don't flash or stay on solid
Hazard lights may not flash (depending on vehicle design)
Irregular or fast flashing (hyperflash can also happen after LED bulb swaps)
Disconnect the battery before servicing electrical components.
Locate the flasher relay in the junction box / fuse panel / relay block; refer to the owner's manual or fuse box cover diagram.
Match OE number (SG158G) and confirm the socket/pin layout before purchase.
Align terminals and press in firmly until fully seated—do not force.
Fitment reminder: Vehicle applications and relay locations vary. Please confirm fitment by OE number SG158G and your vehicle manual/diagram before ordering.