Circuit Protection - Fuses
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Circuit Protection - Fuses
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Special Tools
EL 39200
Digital Multimeter (DMM)
For equivalent regional tools, refer to
Special Tools
.
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 if the element in the fuse is broken (2). If not broken (1), also check for continuity using a Digital Multimeter (DMM) or a continuity tester. If the element is broken or continuity is suspect, replace the fuse with one of equal current rating.
Fuse Types
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Current Rating Amperes
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Color
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Auto Fuses, Mini Fuses
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2
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Gray
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3
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Purple
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5
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Brown
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7.5
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Brown
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10
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Red
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15
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Blue
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20
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Yellow
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25
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White or Natural
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30
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Green
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|
Maxi Fuses
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20
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Yellow
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30
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Light Green
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40
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Orange or Amber
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60
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Blue
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50
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Red
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J-Case Fuses
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20
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Blue
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30
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Pink
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40
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Green
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50
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Red
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60
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Yellow
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Midi Fuses
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80
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Black
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Mega Fuses
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100
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Black
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150
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Black
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200
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Black
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