Here's what I got in my 4 drawer tractor supply tool box.
Top drawer
*Klein mm400 multimeter/temperature reader
*20g, 18g, 12g extra wire
*Solder
*3M electrical tape, different types, moisture and temperature resistant ( stop and don't use cheap electrical tape, just look at OEM tape. Still sticky after yeaaaaars)
*Alligator clips
*Extra switches 20amp rated.
The 3rd drawer has my screw drivers and pliers , wire strippers.
*Klein pliers
*Snap-On strippers and crimpers in one ( best shit no lie )
*Home Depot solder
*Other stuff.
Last drawer is dedicated to t-taps and other stuff....
*20-12g female and male connectors ( 3M, Home Depot quality )
*20-12g weather resistant but connectors ( 3M, Home Depot quality)
*T-taps any size you need
*4g wire but connector
*fuses
*wire nuts
*grommets
*marine and standard shrink wrap
*add on fuse, in line fuse.
Much more
Other drawers hold my wrenches , Allen keys, sockets , hammer and much more
Little tool box for $40 holds almost everything I need.