I try cranking the truck, I get one click and that's all. What's the problem? on 1995 Ford Ranger

there for a while it would crank if I stayed after it but even that doesn't. if i do it often enough it will activate my electric locks. I took starter and celenoid to auto parts store to have it tested. they tested fine there was a blown 30 amp fuse in the fuse box with all the relays in it.i replaced that .

Asked by for the 1995 Ford Ranger
Where is the click coming from?