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Circuit Protection - Fuses

Circuit Protection - Fuses



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 DMM or a continuity tester. If the element is open 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