Wiring harness M-B Sprinter W906 to rear spoiler. Wiring harness for rear spoiler sidelights and workinglights. This kit is for years 2006-2017 cars. Turn working lights on when returning gear is turned on, includes switch to innerpillar to back. Extra wiring for extra switch for example to dashboard coupling. Wiring harness isn't necessary, but get working light installation much easier.