If using the original flasher unit you only need the resistor with your main flasher lamps if those have been changed to LEDs, for the flasher to work. However if you have only fitted the LED repeaters they should be connected in parallel with the the 12v “flash” wire to the main bulbs. By adding the (unnecessary) resistor you have probably dropped the voltage to the point that the repeater LED wont function. However still check polarity as mentioned above. Annoyingly I have seen LED repeaters with either white or black tails needing to be 12v +ve. There doesn't seem to be a firm standard applied, especially if the lamps are from overseas. Peter.
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