Toggle vehicle lights

`U`

All hotkeys for Kerbal Space Program

System/UI Commands Turn view L/R/U/D	`← ↑ → ↓`
System/UI Commands Zoom view in	`Num +`
System/UI Commands Zoom view out	`Num -`
System/UI Commands Debug/cheat menu	`Mod` + `F12`
System/UI Commands f12 (Mac) Open debug console	`Control` + `⌥ Option` + `⌘ Cmd` + `Fn,`
System/UI Commands Orbital map toggle	`M`
System/UI Commands Cycle focus in orbital map	`⭾ Tab`
System/UI Commands Reverse cycle focus in orbital map	`←` + `↑ Shift` + `⭾ Tab`
Flight Controls Activate abort action group	`⬅ Backspace`
System/UI Commands Reset focus in orbital map	`
System/UI Commands Staging (default) controls	`Insert`
System/UI Commands Docking controls	`Del`
System/UI Commands Time warp (physical time warp in atmosphere) increase	`.`
System/UI Commands Time warp (physical time warp in atmosphere) decrease	`,`
System/UI Commands Stop time warp	`/`
System/UI Commands Physical time warp increase (compulsory)	`Mod` + `.`
System/UI Commands Physical time warp decrease (compulsory)	`Mod` + `,`
System/UI Commands Toggle navball	`Num .`
EVA Commands Cycle through active ships/EVAs (forwards)	`]`
EVA Commands Cycle through active ships/EVAs (backwards)	`[`
System/UI Commands Screenshot	`F1`
System/UI Commands Toggle UI visibility	`F2`
System/UI Commands Toggle results screen	`F3`
System/UI Commands Toggle ship labels	`F4`
System/UI Commands Quicksave	`F5`
System/UI Commands Make a specific, user-inputted quicksave	`Mod` + `F5`
System/UI Commands (hold) Load quicksave	`F9`
System/UI Commands Load a specific quicksave	`Mod` + `F9`
System/UI Commands Load saved game state dialogue box (hidden feature, looks in KSP/saves/scenarios/)	`Ctrl` + `F10`
System/UI Commands Temperature Gauges	`F10`
System/UI Commands Temperatures Overlay	`F11`
System/UI Commands Aerodynamic Forces Overlay	`F12`
VAB/SPH Commands Rotate part backwards	`W`
VAB/SPH Commands Rotate part forwards	`S`
VAB/SPH Commands Rotate part counterclockwise (flat)	`A`
VAB/SPH Commands Rotate part clockwise (flat)	`D`
VAB/SPH Commands Rotate part counterclockwise	`Q`
VAB/SPH Commands Rotate part clockwise in VAB	`E`
VAB/SPH Commands Toggle Angle Snap	`C`
Flight Controls Toggle camera view (auto/free/orbital/chase)	`V`
Docking mode Translate forward	`↑ Left Shift`
Docking mode Translate back	`Left Ctrl`
VAB/SPH Commands Reset part rotation	`Space`
Flight Controls Toggle SAS	`T`
VAB/SPH Commands In Rotate mode: Toggle between absolute or relative rotation	`F`
Flight Controls Lock current stage (very useful before you accidentally hit the spacebar)	`Mod` + `L`
Flight Controls Toggle precision ("softer") controls	`⇪ Caps Lock`
VAB/SPH Commands Toggle Symmetry Method between mirror (SPH) or radial (VAB)	`R`
Flight Controls RCS thrust translate forward	`H`
Flight Controls RCS thrust translate backward	`N`
Flight Controls RCS thrust translate down	`I`
Flight Controls RCS thrust translate left	`J`
Flight Controls RCS thrust translate up	`K`
EVA Commands Toggle headlamps	`L`
VAB/SPH Commands Cycle symmetry settings (forward)	`X`
Flight Controls Full throttle	`Z`
Flight Controls Toggle landing gear	`G`
Flight Controls Trim pitch/yaw/roll	`Mod` + `W`
Flight Controls Trim pitch/yaw/roll	`Mod` + `S`
Flight Controls Trim pitch/yaw/roll	`Mod` + `A`
Flight Controls Trim pitch/yaw/roll	`Mod` + `D`
Flight Controls Trim pitch/yaw/roll	`Mod` + `Q`
Flight Controls Trim pitch/yaw/roll	`Mod` + `E`
Flight Controls Reset trim	`Mod` + `X`
EVA Commands Return to cockpit	`B`
Flight Controls Toggle vehicle lights	`U`
Flight Controls Activate custom action group 1-10	`0` - `9`
Flight Controls Open part info window	`Mouse right click`
Flight Controls Open multiple info windows for fuel transfer (right-click on two fuel tanks)	`Mod` + `Mouse right click`
Flight Controls Scroll stage icons up	`Home`
Flight Controls Scroll stage icons down	`End`
EVA Commands (drag down) Pitch up by jet	`Mouse movement`
VAB/SPH Commands Hold to rotate parts in 5° instead of 90° steps	`↑ Shift`
EVA Commands Jet down	`Ctrl`
EVA Commands Jump to different directions when on ladders	`↑ Shift` + `W` + `Space`
EVA Commands Jump to different directions when on ladders	`↑ Shift` + `S` + `Space`
EVA Commands Jump to different directions when on ladders	`↑ Shift` + `A` + `Space`
EVA Commands Jump to different directions when on ladders	`↑ Shift` + `D` + `Space`
EVA Commands Sprint	`↑ Shift` + `W`
EVA Commands Sprint	`↑ Shift` + `S`
EVA Commands Sprint	`↑ Shift` + `A`
EVA Commands Sprint	`↑ Shift` + `D`
VAB/SPH Commands (hold) Disable surface attach/exclusively use node attach	`Mod`
VAB/SPH Commands Undo last action	`Ctrl` + `Z`
VAB/SPH Commands Redo last action	`Ctrl` + `Y`
VAB/SPH Commands Duplicate part or assembly in VAB	`Mod` + `Mouse left click`
VAB/SPH Commands Cycle symmetry settings (backward)	`↑ Shift` + `X`
VAB/SPH Commands Scroll view up	`Page Up`
VAB/SPH Commands Scroll view down	`Page Down`
VAB/SPH Commands Move the entire ship	`↑ Shift` + `Mouse left click`
VAB/SPH Commands Zoom view in	`↑ Shift` + `Mouse wheel up`
VAB/SPH Commands Zoom view out	`↑ Shift` + `Mouse wheel down`
VAB/SPH Commands Place Mode	`1`
VAB/SPH Commands Offset Mode	`2`
VAB/SPH Commands Rotate Mode	`3`
VAB/SPH Commands Root Mode	`4`