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Looking at a fuse may not necessarily tells, if it is bad. There are many different types of fuses. Some you can see through and some you cannot see through physically. The ones you are able to see through are most times made of a GLASS STRUCTURE, which enable you to actually take a close look on the inside of that glass casing to see if there is a break in its connection link.This link or Bi-metal ( the links are called BI_METAL, FUSE ELEMENT, FUSE WIRE etc...) is act as a protection in the event there is a fault or problem in its circuit, to break easily. If your fuse is one that you cannot see through, then you must use an electrical meter to detect whether it's good or bad. Preferably measure fuse when it is taken out of its circuit.

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Q: How Can you tell if a car fuse is bad by looking at it?
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