The starter shouldn't be the problem. Alternator - maybe; but it sounds like it's charging the battery, so it's low on my list at this point. Since the battery is discharging, I suspect an intermittent short; possibly related to the turbo install. Check system voltage with a meter. A recording meter will help spot intermittent problems.
Edit: Didn't fully read previous post. You have low voltage, so the alternator jumps to the top of my list.
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