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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-09-2012, 11:19 AM   #1
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Join Date: May 2012
Location: Home
Posts: 15
My Ride: 318i
318i died while driving


was driving home and suddenly car died. electronics was completely turned off. was not able to put on the blinker to work.

well, then I opened the hood to check how things are battery clamps and suddenly noticed that blinker started working.

after that I tried to turn on the car engine and voilaa - it did start.

E46 is this normal case of such a situation? I mean, the car died when the battery terminals were not connected well.

does not the engine remain working after battery removed. power should come from generator. or am i wrong? if there were problems with generator, then battery should have needed charging too.

sorry for crappy english spelling and grammar.


okay. maybe it did happen too damn quickly and generator was not able to switch from battery to work by itself. logical thinking. cant find any other reason.

Last edited by Tavo; 10-09-2012 at 11:25 AM.
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Old 10-09-2012, 11:32 AM   #2
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Join Date: Sep 2012
Location: Old Greg's Cavern
Posts: 12,671
My Ride: '13 128i, '04 330Ci
The instruments generally run off the battery at all times. The alternator charges the battery. The engine spark runs directly off the alternator though, at least in the cars I've run with a dead battery (a couple Jeeps, a Lexus, and a Honda). If it doesn't run directly off the alternator, then maybe those batteries had just enough charging ability to act as a capacitor for the spark plugs. The car should keep running with a dead cell, but your instruments may act wierd.

Last edited by WDE46; 10-09-2012 at 11:34 AM.
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Old 10-09-2012, 11:40 AM   #3
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Join Date: May 2012
Location: Home
Posts: 15
My Ride: 318i
318i, N42, 2002 december.
asked from friend, he had same thoughts as i did. if i had accelerated during that it might have not died.
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