Cube fuses at the battery provide protection for the electrical circuits connected to your battery (as well as the battery itself) by eliminating unprotected sections of cable between the battery and the first fuse.
A common circuit that uses a cube fuse at the battery is an inverter. If you find that your inverter is not getting power, it’s a good idea to check the fuse.
A burned-out fuse may be obviously damaged, such as in this example:
However, blown cube fuses are not always so easily recognizable and it may be necessary to check the fuse using a multimeter.
To test a fuse cube with a multimeter, the leads of the multimeter must touch from fuse cube bracket or battery post to lug, as shown below.
Placing the leads incorrectly, such as from fuse cube bracket or battery post to threaded post or nut of fuse cube bracket (also shown below), will give an inaccurate result because the lead is touching an insulator rather than making an electrical connection through the fuse.