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It wouldn't be the first one that's needed a starter or an ignition switch, Mark. Don't know what else to tell you. They need to be able to catch it in the act to diagnose it. Either that or rig up a test harness so that you can aid in diagnosing it. You say the lights go dim, which seems to indicate that the battery is going dead, either that or something is restricting the power available and that the battery is actually OK. You can invest in a cheapy Voltmeter at Sears or something and when the lights are dim, put the voltmeter on the battery and see what the battery voltage actually is. If the voltage is fine, say 13 volts or so, and the lights are dim and the truck won't start, then the "truck" is the problem, not the battery, possibly a bad battery cable or clamp.
If the voltage is low, then I'd also state that you wouldn't be the first to be sold a bad battery. The shop could, just as a hunch, test the specific gravity of the individual cells.
Gilly
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