Circuit Protection - Fuses
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Circuit Protection - Fuses
|
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
Current Rating Amperes
|
Color
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Auto Fuses, Mini Fuses
|
2
|
Gray
|
3
|
Purple
|
5
|
Brown
|
7.5
|
Brown
|
10
|
Red
|
15
|
Blue
|
20
|
Yellow
|
25
|
White or Natural
|
30
|
Green
|
Maxi Fuses
|
20
|
Yellow
|
30
|
Light Green
|
40
|
Orange or Amber
|
60
|
Blue
|
50
|
Red
|
J-Case Fuses
|
20
|
Blue
|
30
|
Pink
|
40
|
Green
|
50
|
Red
|
60
|
Yellow
|
Midi Fuses
|
80
|
Black
|
Mega Fuses
|
100
|
Black
|
150
|
Black
|
200
|
Black
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