For a couple of months now when I shut the truck off and pull the key out the clock stays lit. It will shut off for about five seconds and then come back on. I have been through two batteries now and it is getting annoying to say the least. Anyone else having this problem?

Oh, and all of the electronics are stock.

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2000 Ford Ranger 3.0l, 4x4, Extended cab, Manual, Cooper A/T3 Tires.