If your problem is not with your electrical component, the fuse or the relay then you most likely have a wiring problem. Every electrical circuit needs to create a way for electricity to get to the device you are powering and also for the electricity to continue on back to the battery. If one of the wires delivering power or return power is not making a good connection, your electrical component will not work.
The most foolproof way to check a fuse is to pull it out of its receptacle and hook up a continuity tester to both blades of the fuse. But if you do this while the fuse is plugged in, you could get continuity through a path other than the fuse (for instance, both sides of the wire may be grounded when you check the fuse).
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