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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5756
Location: Brighton


PostPosted: Tue Nov 27, 2018 6:55 pm    Post subject: Reply with quote

If you connect a ctek direct to the battery on a 991 then it by passes the battery manager .. in other words the car doesnt know the charge state of the battery and will treat it as if its lower on charge than it actually is .

This can have an effect on things like auto stop start not working .

Im not sure off hand if theres a closer fixing than the far o/s one but any earth point will do other than the neg terminal .
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The return of Marty Wild
Suzuka


Joined: 04 Nov 2016
Posts: 1242



PostPosted: Tue Nov 27, 2018 7:13 pm    Post subject: Reply with quote

Demort, why shouldn’t you use the neg terminal? Risks of sparks igniting gases?

Where should I mount the neg crock clip please?
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Cayman S 987.1
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5756
Location: Brighton


PostPosted: Wed Nov 28, 2018 7:21 pm    Post subject: Reply with quote

On a 991 you have a battery management system .. the car needs to know how much charge goes into the battery and out of it , it will then calculate the charge state .. it will allow for ageing and charge the battery accordingly ..

Ie ... if the battery charge is below 85% the auto stop start wont work .

The cetek lead is normally bolted to the battery terminal and earth so you cant get a spark .. you could in theory with the clamp type .. but OPC,s use that type all the time and Salesman connect them .. never seen one blow up yet.

I can tell you its a bit difficult to actually blow up a battery .. it needs to be gassing so a heavy charge being put into it ..

I know .. ive done it !

A tip .. dont weld near a battery on charge .. you end up deaf with your jumper falling appart due to the battery acid Floor

Marty .. you have a 987 .. you connect it to the battery terminals as you dont have the same system as a 991 ... gasses are vented out of the tube in the side of the battery and vented under the car .

The cetek has a lead with ring terminals that you bolt on .. thats the better type ... you can also run this lead up and out the top of the bonnet to connect the charger to it without having to open the bonnet .
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Suzuka


Joined: 04 Nov 2016
Posts: 1242



PostPosted: Wed Nov 28, 2018 7:35 pm    Post subject: Reply with quote

Cheers, Iain.

I’ve got the charger in the frunk, attached to both terminals.

I sat it on a large piece of slate just in case it got hot, which it didn’t.

The bonnet shuts fine as I made the extension cable myself and chose a slim cable. This way, the charger isn’t exposed to the elements or Tom, Dick n Harry.

24 hours in now, battery fully charged but not pulsing yet. I’m thinking everything seems safe enough. Does not having the battery cover trim in place make for problems do we think?
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5756
Location: Brighton


PostPosted: Thu Nov 29, 2018 7:18 pm    Post subject: Reply with quote

This is very strange .. twice you have replyed to this thread whilst ive been online and ive not seen it either time .. Question

Hmm .. anyways .. charger sounds fine .. battery cover .. yea a small issue there .. if its outside and it rains then water can potentially get into the battery area .. fine if the drains are clear .. not so if they are not .. yours will be or at least should be as i cleared them out on the service but the cover off long term isnt the best .

The cetek system has a small lead with ringlets which you bolt to the terminals .. the lead goes under the battery cover .. you then plug the charger into this .

Thats the only system i know much about im afraid .
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Suzuka


Joined: 04 Nov 2016
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PostPosted: Thu Nov 29, 2018 7:59 pm    Post subject: Reply with quote

Thanks, Iain, I’ve got the battery cover back on now, even with the croc clips still on there. Water still gets in there though doesn’t it, it’s by no means watertight in that area.

Appreciate your seeing to my drains, I’ll keep an eye on them too.

Might put the eyelets on, I see there is a bulkhead between the batt and the frunk. I had thought I could perhaps run the eyelet cable through to beside the multi changer, but I see now, that’s not happening.

I put some road legal HID assemblies onto the Golf the other weekend, those too needed a hardline to the positive terminal and they came with eyelets too. Like most, I couldn’t remove the bolt though. So I cut a slit into the eyelets and got them on that way.
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dirtybarrys
Newbie


Joined: 11 Aug 2011
Posts: 29



PostPosted: Thu Jan 03, 2019 11:56 am    Post subject: CTEK purchased Reply with quote

I bought the CTEK MXS 5.0 and cig lighter connection just before Christmas. It works a treat plugged into the 12V socket in the centre consol in my 991.1 C4s. Perfect!
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