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Circuit Protection - Fuses

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
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