gopupu 3157/4157 T25 LED Load Resistor Harness - 2-Pack 50W 6Ω Prevents Hyper Flash & Warning Lights

The gopupu 3157/4157 T25 LED load resistor harness stops LED hyper-flashing, flicker, and bulb-out warnings by adding the correct load to your vehicle's turn signal circuit.

If you replaced factory incandescent turn bulbs with LEDs and now face rapid flashing, warning messages, or intermittent signal operation, this gopupu resistor harness restores the electrical load so the vehicle registers normal bulb behavior. Designed for 12V systems that use 3157/4157/T25-style connectors (not compatible with some CK-style sockets, Nissan Sentra 2020, or Toyota Tundra), the kit includes two plug-and-play adapters with integrated 50W 6-Ohm resistors and mounting-ready decoding housings.

How does this harness solve hyper flashing and warning lights?

The harness mimics the resistance of a standard filament bulb, which prevents the vehicle’s flasher relay or computer from detecting a low-load LED and triggering fast flash or error codes. It installs in parallel with the LED circuit so the resistor draws additional current only when the signal is active. The decoder housing helps manage heat and reduces interference with the vehicle’s electronics.

• Adds 50W 6-Ohm load per harness to emulate incandescent bulb draw
• Plugs in-line to existing 3157/4157/T25 connectors for quick setup
• Works on most 12V turn signal circuits that expect higher load
• Includes two harnesses for dual-turn-signal setups (left and right)

How simple is installation for a DIYer?

Installation is straightforward: locate the LED’s 3157 wiring, connect the harness in parallel, and secure the resistor on a metal surface away from wiring or plastic. The kit’s plug-style adapters avoid cutting factory wires in many applications, and the wires are long enough to reach common mounting points within the wheel well or under the bumper. However, the resistor becomes hot in use, so use caution during fitment and operation.

• Plug-and-play adapter with 30cm and 34cm wire lengths for flexible routing
• Decoder dimension 5 × 2.8 × 1.6 cm for compact mounting options
• Mount resistor to metal and keep clear of heat-sensitive materials
• No special tools required for most installations, but basic hand tools recommended

Which bulb types and vehicles does it fit and when should I not use it?

This harness is designed for 3157, 4157, T25 and related multi-contact bulbs such as 3357/3457 variants where a 3-locking-tab connector is present. It is not designed for CK-style sockets, and explicit exclusions include some models like the Nissan Sentra 2020 and Toyota Tundra. Always verify your socket type and compare connector shape before purchase.

• Compatible: 3157, 4157, T25, 3357, 3457 and similar 3-locking-tab connectors
• Included: two harnesses rated for 12V systems, each 50W 6-Ohm
• Not compatible with CK sockets, Nissan Sentra 2020, Toyota Tundra
• Check connector shape and pin layout to confirm fitment prior to install

What safety and operational notes should I know?

The resistors dissipate significant heat while active, so mounting them to a grounded metal surface and keeping them away from plastic, wiring looms, and fuel lines is essential. Do not touch the resistor while the turn signal is active or immediately after use. Use appropriate insulation and secure wiring to prevent movement or chafing over time.

• Resistor becomes very hot — mount to metal and avoid flammable materials
• Keep wiring secured and insulated to prevent chafing and shorts
• Designed for 12V systems; ensure electrical compatibility before installation
• Two-pack covers both sides of a vehicle’s turn-signal circuit

Who is this for: The gopupu 3157/4157 T25 LED load resistor harness is ideal for car and truck owners who upgraded to LED turn signals and need a reliable fix for hyper-flash, flicker, or dashboard bulb warnings. It's aimed at DIY installers and professional technicians who want a compact, plug-in solution for compatible 3-tab sockets on 12V systems, provided the vehicle is not excluded by model-specific incompatibility.