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need a resistor in-line both sides, ihave same problem running l.e.d.'s....they draw just about no voltage


Actually a resistor in parallel with the light is one option, helps to increase the *current* to make the factory flasher relay think the bulbs are OK. For the flatbed wiring, might need to add blocking diodes to make the lights compatible or modify the flasher to flash slower:
http://www.pirate4x4.com/forum/showthread.php?t=463125&highlight=fast+blinker