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.
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
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