Basic & Preliminary Notions:

- The Conventional Flasher unit checks constantly the powerdraw for whole direction indicator circuit and detects a failure when the power drops below a defined threshold, LED indicators may create irregular flashing frequency and false failure signals.

- Regulation ECE R48 for failure warning in direction indicator circuit is mandatory, any resistors in LED indicator lamps are illegal.

- ISO 13207-1 standardises the non-failure pulse generated by new LED indicator lamps.