A small, finned metal block found on a truck may be an LED load resistor used in aftermarket lighting systems. When traditional bulbs are replaced with LEDs, the lower power draw can cause rapid turn-signal flashing or dashboard warnings. The resistor connects alongside the LED bulb, drawing extra current to help the vehicle’s monitoring system recognize the expected electrical load. However, it generates significant heat, so proper installation is essential, and some vehicles can use LED-compatible flasher relays instead….SEE BELOW
