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Voltage is critical, as he's experiencing voltage fluctuation. However, if the fluctuation is normal, then it's all good. The alternator likely isn't working while the GP's are on, as stated above. It would put maximum load on the alternator, followed by a sudden release. That's not good on alternators. That's not to say the alternator isn't producing electricity, it's just saying that the computer is fooling it into thinking there's no load, so it doesn't have to try so hard.
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776