i know i saw something on here awhile ago for a switchback turn signal bulb i was curious if anyone had any info on whether or not i could just put it in and run with it or if i needed a resistor or something any info would help
You will need load resistors for each bulb, just on the turn signals. 50 watt 6 ohm load resistors usually stop hyper flash. http://www.fordfullsize.com/forum/f73/switchback-leds-1373/
You can get the resistors and splice and dice or you can get the relay which is about $17. Looks like this and goes under the drivers side dash to the left of the brake pedal. Just unplug the factory relay and plug in the replacement. Easy as pie.