[Frunzik340]

Anyone know how the wiring is supposed to be connected for the rain light to the tail light like what color goes to what wire

[NickMyers]

Hey Frunzik,

This summer I did a rain light install on my '19 G20 330i. I uploaded a youtube tutorial on the entire process. The wiring instructions are in the video.

If you want the short and sweet, the diffuser has 3 wires on it. Yellow, Red, and Black.

The yellow wire will give you a constant connection to the brake light. Meaning it will be on all the time whenever your car is running. This is the wiring configuration I am currently running, but will probably be changing soon...

As far as I'm concerned, using the Red wire from the diffuser will only activate it when you are using your brakes, AKA the intended purpose of the light.

From the tail light, you have to take it out, unplug it and access the wire harness attached to the car. You can see a detailed example on my YouTube.

From the tail light side of things, you only are tampering with the brown wire and the purple/white wire.

The black wire on the diffuser is the ground, which goes to the brown cord on the tail light. Subsequently, you then wire either the Red or Yellow wire (depending on your lighting preference) to the Purple/White wire from the light hardness.

Plug everything back in and you are good to go.

[cc009]

Originally Posted by NickMyers

Hey Frunzik,

This summer I did a rain light install on my '19 G20 330i. I uploaded a youtube tutorial on the entire process. The wiring instructions are in the video.

https://www.youtube.com/watch?v=ZnZU...nnel=NickMyers

If you want the short and sweet, the diffuser has 3 wires on it. Yellow, Red, and Black.

The yellow wire will give you a constant connection to the brake light. Meaning it will be on all the time whenever your car is running. This is the wiring configuration I am currently running, but will probably be changing soon...

As far as I'm concerned, using the Red wire from the diffuser will only activate it when you are using your brakes, AKA the intended purpose of the light.

From the tail light, you have to take it out, unplug it and access the wire harness attached to the car. You can see a detailed example on my YouTube.

From the tail light side of things, you only are tampering with the brown wire and the purple/white wire.

The black wire on the diffuser is the ground, which goes to the brown cord on the tail light. Subsequently, you then wire either the Red or Yellow wire (depending on your lighting preference) to the Purple/White wire from the light hardness.

Plug everything back in and you are good to go.

Awesome information!! I’ve been seeing that rear diffuser for sale lately and I couldn’t tell if it was the correct model because of those added side fin pieces. What exactly are those being held up by? As I swapped diffusers a while back and never noticed any clips over there on the sides. Thanks!!