Hi - I hope everyone is well - I know there are a few Porsche owners here, so am seeking advice
Have not used my 2007 - 987 for a couple of weeks and had the flat battery - cant open bonnet problem
So I read up and bought a charger with a jump start boost Like a complete fool I just connected to the fuse board and door pillar and switched on - The sound of frying ensued..
I switched off and realised the charger was set to 24 Volts output...!!
Nothing works now I tried key in ignition to see if there were any signs of life and that was stuck in there too, but have since used the key release tool.
Have I damaged the system - or is there a fuse somewhere that might have blown - the main ones seem ok in the panel (the charger fuse is ok and it seems to be working)
Would appreciate some help if anyone has any thoughts on this -
Also Don't do the same stupid thing as me - check the output voltage.
Stay safe everyone Cheers Mark
Last edited by MarkEg; 11th April 2020 at 11:16.
I’m afraid it’s probably not good news, I would suggest ecu’s etc are fried and lots of other bits, there was a thread on 911UK about an owner that it happened to and it took a lot of time effort and cash to sort, apologies for the slightly depressing news but just being realistic. I would suggest and auto electrician or a Porsche specialists as a first point of call.
Yes I was afraid of that - have asked on boxa.net too - there may be a relay or something - (he hopes)Originally Posted by ditchvisitor
Should have called the AA - I have home start but thought I could sort myself.
Oh well at least I now Have to Stay at home...
Will update if there is any better news
Thanks for your reply
I don't know about Porsche but I would have hoped a fuse would have failed to protect the car electronics just as if the alternator had failed.
I would start checking the main fuses and work from there. I have added things to cars and bikes over the years and it always surprises me how many hidden fuses you find when doing this away from the main fuse board.
Good luck with it
Could you remove or completely disconnect the battery.
Then see if the battery charges at 12v.
Alternatively just try another battery.
With the Boxter - if you get a flat battery you cant open the bonnet to charge it.
So there is a system to release by attaching a 12v to a special terminal in the fuse box and grounding - which gives power to open.
All good except my charger was set to 24v output.
So have potentially caused a bigger problem and nothing works now even at 12v setting, something has fried - I hope there might be a fuse but could be a lot worse I fear..
Cheers
Mark
Why not still call the AA? At least they might have come across the same situation. You pay them good money to sort your car out when it's broke so let them have a look or tow you to a dealers premises that can sort it as soon as this stuff is over.
I would call Porsche. It would surprise me if that circuit is not protected or dedicated or both. I am guessing 12v doesn't open the bonnet now ?
Some cars you can charge via the cigarette Lighter socket but I expect Porsche have a manual procedure to open the bonnet.
It would surprise me if porsche had invented and documented a bypass in the event of battery failure and not protected it with a fuse incase the owner connects it up wrongly
Thanks - that's given me some hope.
I don't really need the car at the moment - as I can walk to the shops etc - so may try AA after Easter and have emailed my garage owner - there's no rush - just kicking myself about not checking the voltage.
As my old woodwork teacher used to say "Think twice, Cut once"
Cheers
Mark
Last edited by MarkEg; 11th April 2020 at 12:26.
As far as I remember it should be some emergency release cable under the front wing, in case of lock damage.
My 993 has second cable attached to the lock, in case of problems with the mail cable/release.
I'm not sure if the electronic is protected against the "overvoltage", but I'm keeping my fingers crossed for you!
For future info there is a bonnet release catch inside the nsf wheel well. You have to remove the liner to get at it which is just about possible with the front wheel on. It's easier with the front wheel removed but if your car has locking wheel nuts and your locking bolt adapter is where it should be you'll have no choice but to remove the liner with the wheel in situ.
I'd manually open the bonnet as described and disconnect the battery, then if you remove the trim panel around the fusebox there is a bank of relays above it, you may see evidence that one of those has blown.
Try this for the bonnet, forward to 9.30 sec
Don’t give up just yet. I had a flat battery on my 996 earlier this week and connected my 12v charger to the special terminal+ earth and nothing happened. I tried a different and more basic charger and left it connected for a couple hours before enough charge was in the battery to power the frunk release solenoid. The first charger was an “intelligent” thing and I suspect it couldn’t see the battery as it was so flat so it just didn’t put any power out.
Do you have a volt meter? Worth checking to see if the charger is actually proving power before you give up.
Good luck.
This seems like an appalling piece of design which I wouldn't have expected from Porsche. Or is it a security thing that is common on newer cars?
Hope that the prognosis isn't too bad and you can get it going again easily.
Last edited by Wimm; 11th April 2020 at 14:19. Reason: Shocking grammar.
Thanks, am trying that now - I have on 12v trickle charge and if I connect and reconnect the earth I can here a small sound - so something is happening!
Will leave for a few hours and see - thanks again
Any way of putting it through your car insurance at all...unlikely but just a thought.
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What type of charger are you using? Does have an ammeter or charge level indicator? My modern intelligent charger just has a green led and I could not tell that it was not actually Was only when I tried my older dumb charger that it actually started to charge. Fingers crossed for you.
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