Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Protection - Fuses
Special Tools
EL - 39200B Digital Multimeter (DMM)
For equivalent regional tools, refer to Special Tools .
- Good fuse
- Bad fuse
All GM dealers must use genuine GM fuses on the vehicles they service. You should also encourage the use of GM fuses to your customers to assure they are getting the proper electrical system protection.
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.
| Current Rating Amperes | Color |
|---|---|
| Mini | |
| 2 | Gray |
| 3 | Violet |
| 5 | Tan |
| 7.5 | Brown |
| 10 | Red |
| 15 | Blue |
| 20 | Yellow |
| 25 | Natural |
| 30 | Green |
| Low Profile Mini | |
| 2 | Gray |
| 3 | Violet |
| 4 | Pink |
| 5 | Tan |
| 7.5 | Brown |
| 10 | Red |
| 15 | Blue |
| 20 | Yellow |
| 25 | Natural |
| 30 | Green |
| Micro 2 | |
| 5 | Tan |
| 7.5 | Brown |
| 10 | Red |
| 15 | Blue |
| 20 | Yellow |
| 25 | Natural/White |
| 30 | Green |
| Micro 3 | |
| 5 | Tan |
| 7.5 | Brown |
| 10 | Red |
| 15 | Blue |
| Maxi | |
| 20 | Yellow |
| 25 | Gray |
| 30 | Green |
| 40 | Amber |
| 50 | Red |
| 60 | Blue |
| J-Case | |
| 20 | Light Blue |
| 25 | Natural |
| 30 | Pink |
| 40 | Green |
| 50 | Red |
| 60 | Yellow |
| Low Profile J-Case | |
| 20 | Light Blue |
| 25 | Natural |
| 30 | Pink |
| 40 | Green |
| 50 | Red |
| 60 | Yellow |
| M-Case Unslotted | |
| 20 | Light Blue |
| 25 | Natural |
| 30 | Pink |
| 40 | Green |
| 50 | Red |
| 60 | Yellow |
| M-Case Slotted | |
| 20 | Light Blue |
| 25 | Natural |
| 30 | Pink |
| 40 | Green |
| 50 | Red |
| 60 | Yellow |
| Midi | |
| 30 | Black |
| 40 | Black |
| 50 | Black |
| 60 | Black |
| 70 | Black |
| 80 | Black |
| 100 | Black |
| 125 | Black |
| 150 | Black |
| 175 | Black |
| 200 | Black |
| Mega | |
| 40 | Black |
| 60 | Black |
| 80 | Black |
| 100 | Black |
| 125 | Black |
| 150 | Black |
| 175 | Black |
| 200 | Black |
| 225 | Black |
| 250 | Black |
| 300 | Black |
| 350 | Black |
| 400 | Black |
| 450 | Black |
| 500 | Black |
| Single Z-Case | |
| 125 | Black |
| 150 | Black |
| 175 | Black |
| 200 | Black |
| 225 | Black |
| 250 | Black |
| 300 | Black |
| 350 | Black |
| 400 | Black |
| 500 | Black |
| 600 | Black |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.