344 posts · Joined 2011. #10 · Jun 17, 2011. It all depends on what you buy.If you only get LED replacemet bulbs, you probably need resistors. If you buy an Tail light LED upgrade kit they are usually included. As far as the kits go, the cheaper ones have to be hardwired into your original wiring.
Do I Need Resistors for LED Headlights? Now comes the ultimate question. Do you need resistors for your LED headlights? No. You won’t need resistors for LED headlights. These headlights are Plug-n-Play. And are actually quite easy to install.
Sylvania led bulbs for headlights 2017 wrx premium, I’m gonna get sylvania led headlight bulbs, do I need resistors? I’m also doing the c light bulb and fog lights led, high beams will be silver starsLumen® - 7443 / 7444NA LED Bulbs. Lumen® - 7443 / 7444NA PlaZma LED Bulbs. Both of the above models offer a true plug and play installation. NO wiring in resistors, no cutting the lighting harness, absolutely no different fuction that factory bulbs, besides the fact that they are LED.
If you experience hyper flashing when using a turn signal then you would need to use a load resistor on the turn signal circuit. You would just need one per affected circuit. The brake lights, running lights, and backup lights do not need load resistors like # DI34ZR the vast majority of the time. Just the turn signals.