How to Make Your Car Last Forever: Avoid Expensive Repairs, Improve Fuel Economy, Understand Your Warranty, Save Money

If the fuse is good, the metal connection (S-shaped on this fuse) between the two contacts will be visibly
intact. If the fuse is blown, this connection would be burnt through and open. Sometimes a fuse that looks
good will not work correctly because it isn’t properly seated in the fuse box. For this reason, a test light is a
better indicator of a fuse’s behavior than a visual inspection.