[Lonestar]

The Webelectric sequential kit illuminate all 4 tail lights when the brakes are applied. The ones you saw with all 4 lights coming on may have had this kit installed.

 

[avarageerod]

before and after of the sequential tail light kit

 

[hemiwoman]

The Webelectric sequential kit illuminate all 4 tail lights when the brakes are applied. The ones you saw with all 4 lights coming on may have had this kit installed.

That's what I was going to say. Webelectric sequentials .