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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

Violet

5

Tan

7.5

Tan

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