Meyer Nite Saber plow lights were used from 1998 to current. They used Changeover Modules to switch between the vehicle headlamps and plow lights. The turn signals and marker lights still had to be spliced into the vehicle wiring. They worked by sending power from a switch in the cab to the Changeover Modules that have internal relays, and switch power from the vehicle headlamps to the plow lights. They use Headlight Adapters to route power from the vehicle headlamp wiring to the Changeover Module, and out to the plow lights.