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Flashers & Load Resistors for Trucks and Trailers
Electronic turn signal flashers and load resistors for heavy-duty trucks, trailers, and commercial vehicles. Includes LED-compatible flasher units that maintain a legally compliant 60–120 flash-per-minute rate across both LED and incandescent turn signal loads — no hyperflashing, no dash warning lights triggered by low current draw.
Grote flashers make up the majority of the selection, covering a range of pin configurations and mounting styles: 2-pin units that plug into standard round sockets, 3-pin and 5-pin plug-in replacements, and 3-wire surface-mount units with blunt-cut leads. The 44010 operates on 12/24V for mixed-fleet applications. Several units are suitable for vintage and classic trucks as well as modern commercial equipment.
For vehicles where a flasher swap alone doesn't resolve hyperflashing — common when factory wiring expects a specific resistive load — a load resistor installed in parallel with each LED turn signal corrects the problem at the circuit level. One resistor is required per turn signal or headlight position.
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Frequently Asked Flasher Questions:
What is hyperflashing and how do I fix it?
Hyperflashing occurs when LED turn signals flash faster than normal — typically twice the standard rate or more. It happens because LED lamps draw significantly less current than the incandescent bulbs the flasher was designed for. The flasher interprets the lower load as a burned-out bulb and speeds up the flash rate. Two solutions exist: replace the flasher with an LED-compatible unit rated for low-current loads, or install a load resistor in parallel with each LED lamp to restore the expected current draw. Which approach is correct depends on your vehicle's wiring.
How do I know which flasher fits my truck?
Flashers are matched by pin count and connector type (2-pin round socket, 3-pin plug-in, 5-pin plug-in, or 3-wire blunt-cut leads), voltage (12V or 12/24V), and load range. Check the flasher socket in your vehicle first — the pin count and socket shape will narrow the options significantly. If you're replacing a factory flasher in a late 1990s or early 2000s GM truck, see the Grote 44120. For Ford vehicles requiring a 5-pin flasher, see the Grote 44090.
Will an LED-compatible flasher work with incandescent bulbs?
Yes. All Grote electronic flashers in this category are rated for both LED and incandescent loads. They maintain a steady 60–120 flashes per minute regardless of load type, so you can run a mixed system or replace bulbs one position at a time without changing flashers again.
How many load resistors do I need?
One resistor per turn signal or headlight position. If your truck has separate front and rear turn signals on each side, that's four resistors minimum. The Pro LED 34205PTP includes wire splices for inline installation.
What does "variable load" mean on a flasher?
A variable load flasher maintains a consistent flash rate across a wide amperage range — in the case of the Grote 44891, from 1 to 20 amps. This makes it compatible with single-lamp circuits as well as multi-lamp trailer configurations without needing to match the flasher to a specific load size.