Why would the battery of a 1989 Chevy Cheyenne go dead if it is not driven for 2 to 4 days?

Answer 1

I had the same problem in a Buick I had. It was caused by a problem with the computer, which had to be replaced. At least that's where I'd start looking. It causes a low constant drain on the battery.

wouldn't start at the computer more than likely something simple like a diode in the alternator or trunk light switch maybe hood light switch start with the cheaper things first

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I've run into that problem also and when I checked, there was enough moisture from positive to negative posts to drain the battery. And check loose wires from and to the battery. Nothing? Put your car in the garage at night, turn off all the lights, let your eyes get accustomed to the dark and look under the hood for any evidence of any amount of current. I've done that and found the a couple of times.