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Before you read the comments and watch the video, here is the answer: Replace the positive battery cable and terminal.
As explained to me by someone who seems to know: The battery cables are a bunch of thin copper wire all twisted together. Over time, the surface of each individual wire gets oxidized with a layer of green copper oxide. The current passing through the cable travels on the surface of these wires, not so much inside the wires. This coating on the wires prevents the current from travelling. When I grab the cable and move it around, I disturb this coating and allow some current to flow. Until it oxidizes again. It gets worse over time because the electricity flows over the un-oxidized parts, and oxidizes it again. This also explains why it happens on the positive and not the negative battery cable.
Original post:
This is a video of a problem I have been having with my 1996 Ford Ranger, 2WD, 4Cyl. For over a year, disconnecting and reconnecting the battery has fixed it. As the problem got worse and I started replacing parts,each time the problem would go away for a few days or a week, then it would come back. Now it finally will not start at all. Replacing battery cables is the next on the list, but I'm going insane with the way replacing a part will 'fix' it, but only temporarily.