Inline load resistor that restores correct turn signal flash rate when converting trailer lights from incandescent to LED. PL-3 male-to-female pass-through design — installs inline in the existing PL-3 harness without cutting or splicing. 50W rating simulates incandescent load. DOT compliant. 3 wires, factory-molded sealed connectors.
When upgrading trailer turn signal lights from incandescent to LED, the tow vehicle's flasher often reacts to the dramatically reduced current draw of LEDs by hyperflashing — flashing far too fast — or failing to flash at all. The flasher unit is calibrated to the load of incandescent bulbs, and when that load disappears, it either interprets the situation as a burned-out bulb or loses the ability to regulate flash rate entirely.
The Buyers Products 5621012 resolves this with a 50W inline load resistor that adds the correct electrical resistance back into the turn signal circuit, bringing the total current draw back to what the flasher expects. What makes the 5621012 the cleaner installation choice over the 5621010 is its connector configuration: both ends are PL-3 plugs — a 3-pin right angle male plug on the harness side and a 3-pin straight female plug on the light side. This true pass-through design means the equalizer installs inline in the existing PL-3 wiring without any wire cutting, stripping, or splicing. The connectors are factory-molded and sealed against corrosion, and the copper core with insulated vinyl jacket provides optimized conductivity for reliable long-term performance.
Male PL-3 plug on the harness side, female PL-3 plug on the light side — true inline installation with no wire cutting or splicing required
50W load rating simulates incandescent current draw — restores proper flash rate without replacing the tow vehicle's flasher unit
Factory-molded and sealed plugs prevent corrosion at the connection points — important for outdoor trailer lighting applications
Meets DOT specifications for use in truck and trailer turn signal lighting circuits
Both the 5621010 and 5621012 are 50W DOT turn signal load equalizers that fix LED hyperflash. The only difference is the output connector type — which determines how they install: 5621010 (Blunt Cut Leads): Has a male PL-3 plug on the harness side and 3 bare blunt-cut wire leads on the light side. You connect the leads directly to the LED light's wiring — splicing or using wire connectors. Best when the LED light does not have a PL-3 plug of its own, or when the installer prefers direct wire connections. 5621012 (This Product — Male PL-3 to Female PL-3): Has a male PL-3 plug on the harness side and a female PL-3 plug on the light side. The equalizer simply inserts inline between the existing harness plug and the LED light's male PL-3 plug — no wire cutting, no splicing, no exposed leads. Best when the LED light already has a PL-3 plug and the cleanest possible installation is desired. If your new LED turn signal light has a PL-3 plug, the 5621012 is the simpler and cleaner installation.
The 5621012 is a load equalizer / resistor plug — it is not an LED light, amber marker, or turn signal lamp. It is an inline electrical component that installs between the wiring harness and the LED light. Heat note: Load resistors generate heat during operation — do not install in fully enclosed spaces without ventilation, and do not mount against plastic, rubber, or combustible materials. The resistor body should have airflow around it. One per circuit: One 5621012 is needed per turn signal circuit. A trailer with separate left and right turn signal circuits requires two units — one per side. Electronic flasher note: Some modern tow vehicles with fully electronic (solid-state) flasher modules may not respond to a load resistor. In those cases, an LED-compatible electronic flasher module in the tow vehicle may be needed instead.
Installation Steps: 1. Locate the PL-3 Harness Connector: Find the existing PL-3 wiring connector in the trailer's harness at the turn signal position 2. Disconnect Existing Light: Unplug the existing light (incandescent or LED) from the harness PL-3 connector 3. Plug Equalizer Male End into Harness: Insert the 5621012's 3-pin right angle male PL-3 plug into the harness connector 4. Plug LED Light into Equalizer Female End: Insert the LED light's male PL-3 plug into the equalizer's 3-pin straight female PL-3 plug 5. Position the Equalizer: Mount or secure the equalizer body where it has adequate airflow — do not enclose tightly against combustible surfaces 6. Test: Activate the turn signal and confirm the flash rate is normal 7. Repeat for Other Side if Needed Contact Buyers Products at (440) 974-8888 with installation questions.
In The Package: • (1) 5621012 LED Turn Signal Load Equalizer Plug • 3-Pin Right Angle Male PL-3 Plug (Harness Side) • 3-Pin Straight Female PL-3 Plug (Light Side) NOT Included: • LED turn signal light (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.
Both models are 50W DOT-compliant load equalizers that fix LED hyperflash. Select based on your preferred installation method and the LED light's output connector type.