Inline load resistor plug that restores correct turn signal flash rate when replacing incandescent trailer lights with LEDs. Plugs directly into the existing PL-3 wiring harness — no rewiring required. 50W rating simulates the electrical load of an incandescent bulb. DOT compliant. 3-pin right angle male PL-3 plug on one end, 3 blunt cut leads on the other.
When you upgrade a trailer's turn signal lights from incandescent bulbs to LEDs, you often encounter a frustrating side effect: the turn signal flashes far too fast — sometimes called "hyperflash" — or stops working entirely. This happens because the tow vehicle's turn signal flasher relies on the electrical resistance of the incandescent bulb to regulate flash rate. LEDs draw dramatically less current, which the flasher interprets as a burned-out bulb and responds to by either flashing rapidly or not at all.
The Buyers Products 5621010 Load Equalizer solves this by adding the right amount of electrical resistance back into the circuit — simulating the load of an incandescent bulb so the flasher operates at its designed rate. It plugs directly into the PL-3 wiring connector already in the trailer's lighting harness, making installation straightforward without cutting or rewiring. The 50W rating is matched to the typical load of a standard incandescent trailer turn signal bulb. DOT compliant for use on trucks and trailers.
Adds the correct electrical resistance to restore proper flash rate when LEDs replace incandescent turn signal bulbs on a trailer
3-pin right angle male PL-3 plug connects directly to the existing trailer wiring harness — no cutting, splicing, or rewiring required
50W rating simulates the electrical load of a standard incandescent trailer turn signal bulb for correct flasher operation
Meets DOT requirements for use in turn signal circuits on trucks and trailers
Most tow vehicles use a thermal or electronic flasher that relies on the electrical load (current draw) of the turn signal bulbs to control flash rate. Standard incandescent trailer turn signal bulbs draw a predictable amount of current — the flasher is calibrated to that load. When you replace incandescent bulbs with LEDs, current draw drops by 80–90%. The flasher sees this reduced current and interprets it as a burned-out bulb — responding with one of two symptoms: Hyperflash: The signal flashes much faster than normal — often 2–3 times per second instead of the standard ~1 per second. This is the most common symptom. No Flash / No Function: Some flashers simply stop working entirely when the load drops below their minimum threshold. The fix: A load equalizer (also called a load resistor) adds the correct amount of electrical resistance back into the circuit, bringing the total current draw back up to a level the flasher recognizes as normal — restoring the standard flash rate without needing to change the tow vehicle's flasher unit.
The 5621010 is a load equalizer / resistor plug — it is not an LED light, marker light, or turn signal lamp. It is an inline electrical component that installs between the wiring harness and the LED light to correct flash rate. Installation notes: • One 5621010 is needed per turn signal circuit being converted. A trailer with separate left and right turn signals requires two units. • Load equalizers generate heat during operation — they should not be installed in enclosed spaces without adequate ventilation, and should not be mounted against plastic or combustible materials. • The 3 blunt cut leads on the output end connect to the LED light's wiring. Match wire colors to your trailer's wiring convention. If your tow vehicle has an electronic flasher: Some modern tow vehicles with electronic flasher modules may not respond to a load resistor. In those cases, replacing the flasher module with a heavy-duty or LED-compatible unit may be the more appropriate solution.
Installation Steps: 1. Locate the PL-3 Connector: Find the existing PL-3 wiring connector in the trailer's lighting harness at the turn signal position 2. Disconnect Existing Light: Unplug the existing incandescent light from the PL-3 harness connector 3. Plug in the Load Equalizer: Insert the 5621010's male PL-3 plug into the harness connector 4. Connect Blunt Cut Leads to LED Light: Connect the 3 blunt cut output leads from the equalizer to the corresponding wires on the new LED light — match wire colors per your trailer's wiring convention 5. Secure and Test: Secure the load equalizer away from combustible materials and enclosed spaces — it generates heat during operation. Activate the turn signal and confirm correct flash rate 6. Repeat for Other Side: If replacing both left and right turn signal lights, install a second 5621010 on the other circuit Contact Buyers Products at (440) 974-8888 with installation questions.
In The Package: • (1) 5621010 LED Turn Signal Load Equalizer Plug • 3-Pin Right Angle Male PL-3 Plug (Harness Side) • 3 Blunt Cut Leads (Light Side) NOT Included: • LED turn signal light (sold separately — see Buyers Products 5624210 for 4" round or 5626210 for 6" oval) Quantity Note: Order 2 units for a full trailer with separate left and right turn signal circuits.
Buyers Products Company: Phone: (440) 974-8888 Website: buyersproducts.com Buyers Products has been a leading manufacturer of truck and trailer equipment, lighting, and accessories for over 70 years.