Well tonight I checked the voltage across the battery at idle. The magic number topped out at 16.4V.....AT IDLE! After this I promptly ordered a new voltage regulator. Should I drive my 500SE until the new regulator comes?

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1981 300 SD 213k miles "Stock for now"
1999 Super Duty 7.3L 113k miles
1981 300 SD 180k miles "Heavily modified" SOLD