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Old 10-27-2015, 01:29 PM   #1
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Can dead battery be charged from fuse box at 2 amps. ?

Have 02 Boxster base with dead battery and broken hood latch with no emergency release cable present. Is it possible to fully charge battery at 2 amps. from fuse box without damage to electrical system ? Thank you.
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Old 10-27-2015, 01:47 PM   #2
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No. The dead battery cannot be recharged this way, the current requirements are way too high.
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Old 10-27-2015, 04:39 PM   #3
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This is a common problem. Just use "Search".Lots of posts.
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Old 10-27-2015, 04:56 PM   #4
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No. The dead battery cannot be recharged this way, the current requirements are way too high.
How much power does the Boxster use while turned-off, parked, and the doors closed?

Maybe with all the fuses pulled-out, and some patience, the battery could be charged over a few days (if the battery is in good shape). If it's a completely dead battery, and beyond half it's life, chances are poor.
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Old 10-27-2015, 07:20 PM   #5
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Possible if you had weeks

But to get the hood open I used a phillips screwdriver with tape on the side and connected the ground lead to the door latch and it gave enough power to open the hood and then it was a simple task to connect the charger directly to the battery
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Old 10-27-2015, 07:55 PM   #6
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But to get the hood open I used a phillips screwdriver with tape on the side and connected the ground lead to the door latch and it gave enough power to open the hood and then it was a simple task to connect the charger directly to the battery
Yeah but his hood latch is broke. He has been trying to get it open for a few days.
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Old 10-27-2015, 09:10 PM   #7
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Sorry , did not know that...how about the wire release tucked around the bumper somewhere (seems to be in different places)
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Old 10-28-2015, 02:53 AM   #8
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How much power does the Boxster use while turned-off, parked, and the doors closed?

Maybe with all the fuses pulled-out, and some patience, the battery could be charged over a few days (if the battery is in good shape). If it's a completely dead battery, and beyond half it's life, chances are poor.
40-60 mA. The problem is that a dead battery pulls a lot of current (read amps) to come up; the under dash wiring is not designed to handle that kind of load.
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Old 10-28-2015, 03:02 AM   #9
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Instead of charging the battery via the fuse box, why not charge through the cigarette lighter?
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Old 10-28-2015, 03:11 AM   #10
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Well it depends

If the battery is in good condition and the plates have not sulfated it could be done. As said if the battery is in good condition and the internal resistance is not bad you could trickle feed it 1 amp but it might take 100 + hours to charge given losses to internal resistance and condition of the battery.
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Old 10-28-2015, 03:52 AM   #11
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I posted in a thread about a year ago how to unlatch the hood by applying power to the wire that goes to the actuator for the release. Apply 12v to pin 33 on the blue connector on the immobilizer box connection under the driver's seat (I used ground to the door frame latch).

Here's the year old thread:
http://986forum.com/forums/general-discussions/54365-front-trunk-jumper-cable-issues.html

Note that the OP got it to work by using the fuse box connection while the doors were locked.
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Old 10-28-2015, 04:29 AM   #12
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Have you been able to get the engine cover off or could you?? If you can get to the alternator, you could charge thru the large cable. Or the inspection cover behind the seats too.
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Old 10-28-2015, 04:41 AM   #13
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I have a battery saver type device that trickle charges very low current.

If it will switch into charge mode when connected to the fuse box, then it's going to bring the battery back up. If it acts like it's not connected, then the battery is too flat and needs something with more grunt to get it back up to the stage where the trickle charger will start charging it.

To get yourself to that stage, I'd go for the connection on the alternator - assuming that you can get to it?
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Old 10-28-2015, 04:43 AM   #14
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cigarette lighter as charge port

Would the cigarette lighter make a better charge port than the fuse box ?
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Old 10-28-2015, 01:20 PM   #15
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Can not access to alternator at this time ...
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Old 10-28-2015, 06:20 PM   #16
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The the cig lighter is your best option and should be able to handle a slow charge. At least enough to get the frunk open.
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Old 10-28-2015, 06:37 PM   #17
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Wagan Self Charge Auto Jumper : Target
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