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Old 11-18-2013, 12:05 PM
Jeremy5848's Avatar
Jeremy5848 Jeremy5848 is offline
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Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
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-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
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Total. . . . . . . . . . . . 722,685
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