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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 07-08-2014, 08:04 PM   #1
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Join Date: Jul 2014
Location: johannesberg
Posts: 8
My Ride: e46
Thumbs down is it a battery or charging problem?


Scenario: i have an e46 2004 318i (facelift edition) i dont use too often, and my little brother was in town the other week and was using it, and he went to a friend's house, left the key on the "on" position in the ignition with his phone charging through the cigarette lighter port for 8-10hrs (so stupid)

he gets back to the car and the car wont start, and assumes the battery is low, he calls me i come and try to jumpstart the car with my 2010 335i. i get there and try to turn the key and the was originally a thumping sound from the hood, headlights flicking, flicking dash lights on each turn....

anyway because the car was in a parking bay and the position it was in i connected jumper cables to the front terminals of my 335i and to the battery of my 318i to jumpstart it, it started up within the first 2 minutes, but once i removed the jumper cables after 30seconds to a minute the cabin lights and the dash lights start to fade and the car switches off and wont start up again, and its back to headlights flicking, flicking dash lights on each turn....

note: battery was bought march 29th 2014 (so its 3.5months old)
wen its running and i remove jumper cable and i put a screwdriver next to the alternator pulley the pulley is still magnetized.(i once heard the that implies alternator is charging),
couldnt remove a battery terminal to test if car stil runs withought, because it switches off before i get to the back

What could be the problem? dead battery, or does the battery need me to jumpstart it longer or is car not charging?
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alternator, battery, charging

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