The fuse is the most common method of an automotive wiring circuit protection.

Whenever there is an excessive amount of current flowing through a circuit the fusible element will
melt and create an open or incomplete circuit. Fuses are a one time protection device and must be
replaced each time the circuit is overloaded.

To determine if a fuse is open, remove the suspected fuse and examine the element in the fuse for
an open (2). If not broken (1), also check for continuity using a
Digital Multi Meter or a Test Light. If
the element is open or continuity is suspect, replace the fuse with one of equal current rating.
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How To Check Fuses
How To Check For A Blown Fuse.
Amp Ratings For Fuses
  • 2-  Gray
  • 3-  Violet
  • 5-  Tan
  • 7.5- Brown
  • 10-  Red
  • 15-  Blue
  • 20-  Yellow
  • 25-  White or Natural
  • 30-  Green
Mini Fuses
Maxi Fuses
  • 20-  Yellow
  • 30-  Light green
  • 40-  Orange or Amber
  • 50-  Red
  • 60-  Blue
J- Case Fuses
  • 20-  Blue
  • 30-  Pink
  • 40-  Green
  • 50-  Red
  • 60-  Yellow