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Nice measurements. A few users have done this over the years, but I don't think anyone with a truck has.
If you have a 20A draw thats about 260W (at 13V which is more where it is when the engine is running). That means the engine has to put out double that (alternators are roughly 50-60% efficient). Thats about 2/3 hp just to have headlights and your fan on low.
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