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hermes
Trainee


Joined: 08 May 2017
Posts: 77



PostPosted: Mon Apr 15, 2019 6:27 am    Post subject: Flat batteries and opening frunks Reply with quote

I'm going to be leaving my 997 at the office for 4 weeks, during which time
I know the battery will go flat, so my plan is to disconnect it rather than
let it drain.

Does anyone know if a jump starter pack can be used to pop the bonnet from
the fuse box?

TIA
 
  
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7067
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Mon Apr 15, 2019 6:40 am    Post subject: Reply with quote

As an aside, how are you going to lock the car when it there? I often disconnect the battery on my 996 C2, but always end up leaving it with the passenger door unlocked as I haven't figured out how to leave the car secure.

MC
 
  
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pzero
General
General


Joined: 18 Jul 2010
Posts: 5356
Location: London


PostPosted: Mon Apr 15, 2019 6:42 am    Post subject: Reply with quote

http://911uk.com/viewtopic.php?t=56267
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hermes
Trainee


Joined: 08 May 2017
Posts: 77



PostPosted: Mon Apr 15, 2019 6:54 am    Post subject: Flat batteries and opening frunks Reply with quote

Aha! Thanks.
 
  
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hermes
Trainee


Joined: 08 May 2017
Posts: 77



PostPosted: Sun May 05, 2019 9:06 am    Post subject: Reply with quote

Just to update this thread, I found I could not open the frunk via the backup electric connection in the footwell using a NOCO Jump Start Booster, and instead had to use a regular car battery.

Not sure if this was user error on my part or not.
 
  
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hermes
Trainee


Joined: 08 May 2017
Posts: 77



PostPosted: Fri May 10, 2019 9:07 am    Post subject: Reply with quote

Another update. Seems the NOCO booster I have needs to detect a battery to function (RTFM and all that), so it won't help with opening the frunk if the battery is disconnected.

I solved the problem with one of these:

https://www.amazon.co.uk/Yuasa-Battery-NP1-2-12-1-2Ah-YUASA/dp/B00WAOGX4Q

Looks big in the picture, but fits in your hand.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6761
Location: Brighton


PostPosted: Fri May 10, 2019 6:50 pm    Post subject: Reply with quote

Just to point out ..

If you have a flat battery or the leads removed from the battery then its the same thing .. no electrical charge to the system .

A jump pack on the red pin and you Must use the door check strap as an earth , don't use the rear pin the door lock attaches to .

It will not work on the first attempt or the second etc .. but you keep pressing the fob bonnet unlock and the floor bonnet unlock switch .. after 10 attempts or so it will open .

If not check and reposition the jump leads .

it can be a pain , it will work in the end though .. that's from someone thats done hundreds of these over the years Very Happy

I only know of jump packs so cant comment on these small battery types .. difference between a garage and a user i guess .. our jump pack would start a truck Smile
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hermes
Trainee


Joined: 08 May 2017
Posts: 77



PostPosted: Sat May 11, 2019 1:05 pm    Post subject: Reply with quote

I understand your point about the battery connection, and I’m not really sure how the NOCO works. I’ve not had much time yet to experiment with it, but I have observed that it behaves differently if the battery is in the circuit (albeit a charged battery).

I also used the rear pin door latch as the earth(!) and could open the frunk this way while the battery was disconnected, using a spare car battery, and my little 12V battery, but not at all with the NOCO.

Your point about using the door strap is noted.

In the short term I’ve solved the problem for 10 quid, but will keep fiddling....
 
  
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Magic919
Suzuka


Joined: 05 Jun 2013
Posts: 1165
Location: Berkshire


PostPosted: Sat May 11, 2019 1:37 pm    Post subject: Reply with quote

Some chargers seem to want to ‘see’ voltage before they spring into life. I presume your booster is similar.
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