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percy
Joined: 12 Feb 2004
Posts: 11
Location: London, UK
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 Posted: Thu Sep 23, 2004 2:48 am Post subject: Another 924 electrics problem |
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I've had the alternator stripped down and cleaned etc and some burnt/decayed cables replaced to fix a "not charging" problem.
The voltmeter was showing a good charge after this but in only 300 miles 2 batteries have been completely flattened. The first was just over 3 years old and the new relacement went flat after only 7 miles and being left overnight.
Something is obviously seriously shorting out - anyone else had this?
Its an '80 auto by the way. |
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Lizard
Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada
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| Posted: Thu Sep 23, 2004 4:18 am Post subject: |
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well I would recommend that you make sure you are still charging, you should be producing roughly 13.6 volts.
if you are then you need to check for load, you need to get a volt meter and disconnect the neg and then put a ammeter between the neg and the battery, once this is done you need to pull a fuse and see if it drops measure the drop from each fuse being removed and then when you find out which fuses are using the voltage come back and let us know and we can go from there, also you could look in haynes to see what those fuses do.
also you can run the car have the battery fully charged and then disconnect the battery when you turn it off and see if the battery still dies
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3 928s, |
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Sleykin
Joined: 30 Apr 2003
Posts: 758
Location: Medford, Oregon USA
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| Posted: Thu Sep 23, 2004 8:43 am Post subject: |
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One sometimes overlooked item. New batteries come with a coating on the posts. If you did not clean the new battery posts they can do a nasty like that.
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Glenn Neff
Medford, OR
87' 924S |
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percy
Joined: 12 Feb 2004
Posts: 11
Location: London, UK
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| Posted: Tue Oct 12, 2004 2:57 am Post subject: 924 batttery flattening problem. |
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| Lizard wrote: | well I would recommend that you make sure you are still charging, you should be producing roughly 13.6 volts.
if you are then you need to check for load, you need to get a volt meter and disconnect the neg and then put a ammeter between the neg and the battery, once this is done you need to pull a fuse and see if it drops measure the drop from each fuse being removed and then when you find out which fuses are using the voltage come back and let us know and we can go from there, also you could look in haynes to see what those fuses do.
also you can run the car have the battery fully charged and then disconnect the battery when you turn it off and see if the battery still dies |
Hello Lizard,
I'm now on 4th battery! The Auto electrician thinks that the first fuse in the aux fuse box (i.e NOT the one with the plastic door on the front) has a load on it even with ignition off. Its a 25amp fuse and definitely controls the interior fan which seems to work ok, but there is still a drain when everything else is off.
My Haynes book doesn't even show that fuse, so do you have any ideas what else can be on that fuseway?
I am going to follow your advise and keep the battery unplugged overnight until this gets sorted. Thank you in advance for any advice you might have to offer.
D |
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John Brown
Joined: 07 Nov 2002
Posts: 903
Location: Leesburg VA
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| Posted: Tue Oct 12, 2004 10:22 am Post subject: Strange but true |
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or stranger than fiction.
The heater controls may be so gunked up that there is a low-grade short to ground. Also may be via aforementioned gunk and the wire cable to the heater coolant flow valve.
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82 |
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