It depends on the bulb. In my 3rd gen I was able to use some morimoto bulbs that have the resistor built in because they didn't require any resistor.

 

most of the newer bulbs you do not need a extra resistor as they are built in, read the fine print on the bulb add

 

I bought Lasfit backup bulbs,no resistor needed.What a difference.

 

I have replaced the front signals, back up lights, tag lights, third brake light, and cargo light with LED. Only the front signals needed resistors. Plan to replace the brake and rear signals soon.

 

Replaced my backup lights in my 2nd gen with diode dynamics LED, no issues. Took the same LEDs and put in my 3rd gen, again no issues. Buy Diode Dynamics and no extras needed.

 

Resistors are for turn signals and brakes. Reverse lights are constant on, so no resistors needed.

I installed Diode Dynamics, then ended up cutting flush mounts into the bumper for SS3 Sports to give me adequate light in the midnight winters of AK.

 

Thanks for the replies everyone, I appreciate it!