Lighting upgrades. All the new marker lights turn off when you turn off the parking lights; also they don't come on with the B/O lights, just the regular park lights/headlights.
Edit to add: The first picture is some red dome lights I added to the cab. If I need regular white light, I can just pop the cover off. I wired in two 12V clearance lights in series for 24V and wired them into a switch on the dash.
The marker lights are all still 12V, but are relayed from the 24V system and tapped off one battery for the time being. To balance things out, the two aux lights are tapped off the other battery.