Battery light when reving
#3
#5
#6
#10
Could let AutoZone do a (free?) charging system analysis with a pocket tester while alternator is still installed, just to be safe. Undercharging at high rpm will probably just evolve into eventually discharging at a lower and lower rpm and leave the truck stranded, especially with AC season coming up. Overcharging could be worse if voltage gets too high - I've seen fried ECMs because of bad regulators. If battery smells bad or looks like it's been boilimg over I'd guess overcharging. If not, I'd agree with just being worn out.
#12
expensive electronics, like the PCM, GEM, and even the alternator voltage regulator.
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