Originally Posted by gunner
bkahler I believe your 310 is the same as my 345 where there is one bulb that has two circuits for lights and the other for brakes/turn signal can you clarify what you used for that bulb, resistor, non-resister or adding a resistor to each bulb.
The 310 bulbs were changed to LED back in 2007 and I don't remember where they came from. I've not dealt with resistor, non-resistor type bulbs and not sure why there is an issue. The brake/turn light bulbs were probably 1157 type bulbs originally and the tail light bulbs were probably 1156 bulbs.
I would think as long as the LEDs you buy are designed to replace 1157 or 1156 bulbs then there should be no issue other than potential cruise control problems. The reason there is a problem with cruise controls is the cruise control manufacturers in their design took advantage of how the brake light circuit works when used with incandescent (1157) bulbs. With 1157 bulbs there is a resistance to ground where the cruise control is connected and with LEDs there is a different (probably high) resistance to ground. The cruise control used that drop in resistance to know when the brake pedal was being pushed. With LEDs that signal value has changed so the cruise control doesn't know when the pedal is pushed.
That's why I went to the relay method because I can now change to any bulb I want and not worry about the cruise control working or not working.