Courtesy, if a toggle (ON/OFF) is isle lights inside the RV
If it is a momentary (ON) off or (OFF) on (It really makes no difference which)
Then it flashes the tail and marker lights to say "Tank you" to someone who flashes you back over into the right lane after passing.. NOTE> on some RV's the tail/marker lights must be ON for it to work.
Ever need a Jump Start? Well the BOOST button "Jumps" the chassis and house batteries together to assist if the chassis battery is low.. May also work for the Generator (Does on my rig) if the house batteries are low.
HOld for no more than 30 seconds, then wait for 1 minute and try starting while holding the button.