gopupu 3157/4157 T25 LED Load Resistor Harness 2-Pack — 50W/6Ω Stops Hyper-Flash & Flicker

gopupu's 3157/4157 T25 LED load resistor harness stabilizes LED turn signals to stop hyper-flashing, flickering, and bulb-out warnings by adding the correct load to the circuit.

Swapping factory incandescent bulbs for low-draw LEDs often causes the vehicle's flasher relay or body control module to signal a fault, flash too quickly, or flicker. This compact resistor harness plugs inline with your 3157/4157/T25-style LED turn signal bulbs and increases the circuit draw to mimic the original bulb load. Designed for do-it-yourself installation, the harness is a simple electrical solution for common LED conversion issues without modifying the vehicle’s wiring harness permanently.

How does the harness stop hyper flashing and bulb-out warnings?

The harness places a 50W, 6-ohm resistor in parallel with the LED lamp, increasing total circuit wattage so the vehicle sees a normal load. That prevents the flasher or BCM from interpreting the LED as a failed bulb and returns flash cadence to normal.

• Works by adding resistive load equivalent to original incandescent bulbs
• Resistor rated 50W, 6 ohms, suitable for most 12V systems
• Parallel connection avoids altering LED wiring polarity
• Installs inline—no cutting of factory harness required

Which bulb sockets and vehicles is this compatible with?

This harness is made for 3157, 4157 and T25-style sockets and a range of related part numbers listed in product specs. It fits three-locking-tab connectors and common switchback LED adapters but is not universal: it does not fit CK sockets and excludes certain models like the Nissan Sentra 2020 and Toyota Tundra.

• Compatible: 3157, 4157, T25, 3357ALL, 4114K, 3157X and similar
• Not compatible: CK socket types, Nissan Sentra 2020, Toyota Tundra
• Check physical connector shape before purchase
• Sold as a 2-pack for left and right side installations

What are the physical dimensions and installation considerations?

The harness includes plug and socket leads and a compact decoder housing. Wire lengths and decoder size make it easy to route near the headlamp or signal housing, but the resistor generates heat so mounting to metal and keeping it away from plastic and wiring is required.

• Plug wire length: 30 cm (11.81") and socket wire length: 34 cm (13.39")
• Decoder housing: 5 x 2.8 x 1.6 cm (approx. 1.97" x 1.10" x 0.63")
• Resistor will become very hot—mount on metal surface and clear of meltable materials
• Voltage rating: 12V; package contains two harnesses and two resistors

Who this product is for: Installers and DIY car owners converting turn signals to LED who need a reliable, reversible fix for hyper flash, rapid blink, or dashboard bulb warnings. It suits those using 3157/4157/T25-style LEDs and who can mount a heat-producing resistor safely. If your vehicle uses a CK socket or specific excluded models, check fitment before buying. The gopupu harness is a practical, inexpensive accessory to restore correct signal behavior without modifying factory electronics.