The BEST way is to buy a "12Volt Test Light" any parts store will have them, dont buy the cheapest, buy a good one, it will last for years. Using the light, ground the clip, then you can use the sharp end to test both sides of the fuse. If both sides are "hot" then the fuse is good, If one side is HOT but not the other, the fuse is bad. If both sides are dead, then the fuse isnt getting any power. Some fuses only have power when the key is on.
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