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If it jumps around at idle, it is not normal. If it changes depending on electrical load, it is normal.
Mine is at 12.3ish at idle with a warm engine and light electrical load (no A/C or headlights, no fans), but increases whenever load does, or other parameters already mentioned. I looked in my factory electrical troubleshooting manual for the exact conditions, but I think it is in the main manual.
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