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A fully charged new battery will float at ~13 Volts disconnected from the car but system voltage will gradually drop due to "phantom loads" (clock, radio memory, etc.) and, over the years, aging of the battery.
The preglow relay should click off after ~30 seconds. If it does not, it will not only eat the glow plugs but drain the battery, since the glow plugs draw more than the typical alternator can supply in typical driving.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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