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Please Help!! Dead Battery......
Hi Everyone,
Hopefully someone can help.. I have a 1999 C4, One night last week, the battery in my key was dead so i had to manually unlock the doors...Everything was fine, car started, no problems, (put in a new battery in my key) ......The next morning the car was completely dead, no interior lights, nothing.....I jumped the car, car started...next morning dead again... Yesterday morning i had a new Battery installed and alternator checked...everything was fine, used the car all day....Again this morning the car was completely dead. Any suggestions on what this could be??? Please help Thanks
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-Derrick 1987 924S 1999 Carrera 4 |
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06-21-2009, 11:36 AM
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You have a drain in the system somewhere.
Try pulling the fuses one at a time to see if there is a spark when doing so. Or....pull the fuse and put a volt meter across the terminals of that fuse and see if there is voltage. If there is...that means the load side of the fuse is grounded...or close to it. If the meter has an Amp setting....measure the flow. Anything more than a few milliamps will flatten a battery quickly. Bob
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Bob Hutson |
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06-21-2009, 01:04 PM
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Northern Motorhead
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Like HawgRyder says you have to pinpoint which circuit is draining current.You can connect an ohmeter to your battery and set it to milliamps and remove one fuse at a time and check your meter to see which fuse is removed when your meter indicates no more power loss.
Of course you will always have a minimat power drainage because of the clock and radio settings but the way you describe it,my guess would be a noticeable difference when you remove the right fuse.
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Cheers Phil 89 Coupe,Black,95 3.6 engine and the list goes on ... 1983 944 SP2 race car PCA #96 |
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06-21-2009, 06:48 PM
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I'll state the obvious: Post this on a 996 forum either here or on Rennlist for some firsthand experiences of where to look. This is a pre-89 forum.
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Ed Hughes 2015 981 Cayman GTS 6 speed,Racing Yellow Past:1984 911 Targa (Ruby), 1995 993C2 (Sapphire), 1991 928S4 |
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06-21-2009, 07:04 PM
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By using the key to open the door you may have activated the self destruct program! Just kidding, I would listen to efhughes3 and the others. It appears to be two separate issues, one that can be readily answered by someone familiar with a 996.
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A nose heavy airplane flies poorly, a tail heavy plane flies once. |
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06-21-2009, 09:25 PM
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Join Date: Apr 2009
Location: Cape Vincent, NY
Posts: 841
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Easy way to find the cricuit is a clamp-style ammeter... just check each line from the fuse box to find the drain.
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1968 911S "Leona" Air goes in and out, blood goes round and round, any variation on this is a bad thing. |
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06-22-2009, 06:06 AM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Please check the archives for the suggested procedure to check for current drain with ignition OFF.
The responses here are correct in some respects; incorrect in others. A clamp DC ammeter is great and convenient if you can afford one. Sherwood |
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06-22-2009, 09:53 AM
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Mo money = mo parts
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Another option would be to purchase a test light like the one in the picture. Disconnect the battery and attach the alligator clip to the battery cable, then touch the tip of the test light to the negative battery terminal. If the light comes on, then you probably do have a fault that is draining the battery. As others suggest, pull one fuse at a time to try to isolate the circuit.
Once the circuit is identified, you can post the results. 
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Greg 86 Coupe (stock - pretty much like Butzi designed it) 65 Ducati Monza 250 & 66 Monza Junior (project) "if you are lucky enough to own a Porsche, you are lucky enough" |
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06-22-2009, 10:18 AM
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Harley
1984 Porsche 911 Targa 3.4L
Sapphire
1979 Porsche 911SC
1986 Porsche 911
