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michaelbbwalker
Trainee


Joined: 23 Nov 2016
Posts: 62
Location: Cardiff

2005 Porsche 997 Carrera 2S

PostPosted: Thu Feb 15, 2018 11:32 pm    Post subject: battery, starter motor, or the other wire bit... Reply with quote

haven't really driven my 2005 997S much at all over winter, I've tried my best to take it out once a week or so just to keep it ticking over though... last few times the battery is nearly dead after a week, looking at other forums / posts on google, people saying they leave it for weeks without any issues?
is my battery likely to be knackered, or starter / other cable bit that needs replacing?
I had (well the car did) a hartech rebuild a couple of years ago, the starter was replaced then and also I can see on the invoice "wiring harness 99760701804" which I can see is the wiring harness for starter motor and alternator, but I read that the replacement part when this fails is thicker or something, does anyone who has had this replaced know the part number of the later (better) part?
I also have read countless mentions of Bosch s5 batteries being a great replacement, I don't know what's on the car at the moment but does it sound as though my battery may be on the way out?
 
  
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edge
Nürburgring


Joined: 25 Mar 2008
Posts: 438
Location: Devon


PostPosted: Fri Feb 16, 2018 12:00 am    Post subject: Reply with quote

I have to fit the Moll battery on my car for warranty reasons and I am on my 3rd in 8 years , they are rubbish especially if you lay the car up over winter.
If your Battery is the Porsche specific Moll battery and its 3 or 4 years old I would ditch it and change for a better make unless of course you subscribe to the Porsche warranty then you don't have that option. Check the earth strap as they have been known to go high resistance.
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michaelbbwalker
Trainee


Joined: 23 Nov 2016
Posts: 62
Location: Cardiff

2005 Porsche 997 Carrera 2S

PostPosted: Fri Feb 16, 2018 12:10 am    Post subject: Reply with quote

nope no warranty here!! I will check what type of battery it is in the morning, can't be arsed going out there this late Very Happy
 
  
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mzmini
Barcelona


Joined: 30 Jan 2015
Posts: 1441
Location: Somerset


PostPosted: Fri Feb 16, 2018 6:40 am    Post subject: Reply with quote

Just fitted a Bosch S4 80AH starts like a dream after years of will it wont it on a cold winters morning
money well spent
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987 Boxster 3.4S
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Fri Feb 16, 2018 6:51 am    Post subject: Reply with quote

Anyone measured the volts on their battery.

Mine doesnt seem to be more than 12.2V after a long run when I would assume fully charged and more likely to be 12.6 volts.

If left for a week or two it shows 11.8v which should mean a dead battery but it starts first time without hesitation.

My volt meter doesnt need a calibration as I've tried it on the wifes car and the volts are where you would expect them when fully charged at 12.6 volts.

Seems very strange. Voltmeter suggestes the battery is finished but it starts first time???

Any suggestions I m not the best with electrickery Question
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5570
Location: Brighton


PostPosted: Fri Feb 16, 2018 8:09 pm    Post subject: Reply with quote

@ michaelbbwalker

Get your local garage to do a battery test .. charge test and a discharge test .

It could be the battery or a drain and a drain will tend to kill a battery .. batterys dont like going totally flat and thats where the Moll fell over .. it didnt recover like some other makes .

Bosch S5 Thumb

The most obvious is the battery but it makes sense to get all options checked .

You have had the starter motor and the main lead replaced .. thats the other place they can cause problems but mainly with hot start .

There is another but you have the wrong symptoms for a power dist fault so im discounting that .


@ Steve997

An alternator will never fully charge a battery .. only a trickle charger will .. i cant remember the exact specs but its something like 80% charged and it will rapidly fall off chargeing it much further .

11.8 will start a car no problem but is a little low , you have to remember its the amps that start the car .. the pushing power if you like thats stored in the battery .

A battery is Approx 2.1 volt per cell .. but that is new and fully charged .

One test i would suggest .. start the car and let it idle , turn on lights and main beam , heated seats , radio etc .. put a large load on it then measure the battery with your meter .. 13.2 or above its ok .. about 13 and your alternator is pretty tired .

Less than 12.5 and it needs to goto a garage !
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Sat Feb 17, 2018 7:48 am    Post subject: Reply with quote

Appreciate the help. Will carry out the suggested test. Thanks for the help.
 
  
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michaelbbwalker
Trainee


Joined: 23 Nov 2016
Posts: 62
Location: Cardiff

2005 Porsche 997 Carrera 2S

PostPosted: Sun Feb 18, 2018 1:46 am    Post subject: Reply with quote

I checked earlier, its an exide (premium!), never heard of them. .. where can I get a bosch s5 then, if anyone has a link to the correct one that would be handy... after I get a battery test of course...
 



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Magic919
Österreich


Joined: 05 Jun 2013
Posts: 909
Location: Berkshire


PostPosted: Sun Feb 18, 2018 7:57 am    Post subject: Reply with quote

Bosch S5 110. https://www.tayna.co.uk/car-batteries/bosch/s5010/
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Sun Feb 18, 2018 10:16 am    Post subject: Reply with quote

A local autocentre - Bosch, halfords or Quickfit etc might do a free battery test
 
  
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mzmini
Barcelona


Joined: 30 Jan 2015
Posts: 1441
Location: Somerset


PostPosted: Sun Feb 18, 2018 10:27 am    Post subject: Reply with quote

Car Parts 4 Less or Tanya sell Bosch batteries
_________________
997 3.8 C2S
987 Boxster 3.4S
Disco 3
2012 VW Polo

1964 1071 Cooper S
1964 1071 Cooper S 1991 Pirelli Classic winner
1971 1275 Cooper S as new time warp
1996 106 Peugeot van (pride of the fleet)
 
  
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michaelbbwalker
Trainee


Joined: 23 Nov 2016
Posts: 62
Location: Cardiff

2005 Porsche 997 Carrera 2S

PostPosted: Sun Feb 18, 2018 10:38 am    Post subject: Reply with quote

Thanks for the info guys will stick a new battery on the list! Wasn't sure which was the correct one to buy...
 
  
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Steve997
Monza


Joined: 11 Aug 2013
Posts: 230



PostPosted: Sun Feb 18, 2018 12:14 pm    Post subject: Reply with quote

Halfords stock the Bosch S5 for the 997.

plenty of branches about so should be easy to get one
 
  
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michaelbbwalker
Trainee


Joined: 23 Nov 2016
Posts: 62
Location: Cardiff

2005 Porsche 997 Carrera 2S

PostPosted: Mon Mar 05, 2018 7:32 am    Post subject: Reply with quote

Ok... so while I've been on holiday I asked my dad to start the car every few days so it didn't go flat, I guess the cold weather has made things worse as apparently last time he tried it wouldn't start.
Should I ask him to pop the lid / frunk or whatever and leave it unlocked til I get home in a few days so I don't have to go through the crap to open the frunk with a battery etc.... the car is garaged anyway...
Also what is a suitable grounding point for when I do jump start it? Is there one near the battery as I have a starter pack so the cables aren't very long on those, think I've seen some metal bars near the battery? Or do people just connect to the negative battery terminal, it does mention that in the manual...
 
  
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MarkC4S
Monza


Joined: 05 Jul 2016
Posts: 150



PostPosted: Mon Mar 05, 2018 11:30 am    Post subject: Reply with quote

Well you learn something every day. Dermot, why is it that an alternator won't fully charge the battery?
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5570
Location: Brighton


PostPosted: Mon Mar 05, 2018 5:05 pm    Post subject: Reply with quote

I was told this many years ago on a training course so have never fully investigated it , bear in mind i started electrics in 1985 !

So .. my thoughts on it Smile


Alternator output is about 13.4 on a standard output , this does vary with the state of charge in the battery and loads so 13-15 volts .. a fully charged battery is about 13 volts and the higher the state of charge in a battery then the slower it will take to charge due to restistance ..

I tend to think of it as filling a bath .. if you want it at the brim then you cant keep the water tap fully open .. you have to slow it down to a trickle .

The battery is constantly being charged and constantly supplying current for all the electrical items so water is going in and out of the bath at different amounts over time .

80% is probably more of an older figure .. i would expect current cars to be higher at around 95% as technology has improved .

You also have to factor in wear and tear for the alternator , the wiring and the battery .


Thats my guess anyways Very Happy
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Last edited by deMort on Mon Mar 05, 2018 6:14 pm; edited 1 time in total
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5570
Location: Brighton


PostPosted: Mon Mar 05, 2018 5:13 pm    Post subject: Reply with quote

@ michaelbbwalker

A flat battery will take 2 hours to be about 80% charged at an rpm of at least 1500 .

Starting a car and leaveing it running for 10 mins or so will probably take out the same as is put in .

Get him to pop the bonnet then with a screwdriver push the latch shut .. the light will go off and the car will think its closed .

For jump starting then you just connect to the battery .. both leads are black so in a dark garage make sure you connect the leads correctly .

You can see the earth lead connects to the body though as its very short .

Jump pack can normally sit to one side of the battery if it has short leads .

Youll have to reset the windows so press and hold the switch up for 5 seconds both sides and the warning lights will go after a short drive .
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michaelbbwalker
Trainee


Joined: 23 Nov 2016
Posts: 62
Location: Cardiff

2005 Porsche 997 Carrera 2S

PostPosted: Thu Mar 08, 2018 5:16 pm    Post subject: Reply with quote

Update... so im home now Sad I tried with my starter pack, no joy it didn't have enough juice... so charged it up and still no good... popped over to a guy across the road who lent me his jumper cables, and also a battery he had charged. .. it was only a small battery and didn't have enough power either, so we fitted the jump leads to my wife's 4x4, had to daisy chain 3 cables together to reach the battery, I struggled to find a decent ground point so we tried a few but even jumping off another car it didn't want to start! He also lent me his battery charger so ill see if it will charge it up enough to start...
Its proving more tricky than I expected to get this going, im getting a lot of clicking when I try and start it so hope it's not the starter motor jammed, does that happen on these cars??
Will report back after the battery is charged!
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5570
Location: Brighton


PostPosted: Thu Mar 08, 2018 7:49 pm    Post subject: Reply with quote

If the battery is totally dead then it will be a struggle to jump start it .

In this position you are better off fitting a new battery .

Try trickle chargeing the old battery but if no good then a new one is required .

The starter solinoid will click with low current .. so a click from the engine is what you will hear .. it is similar to a starter motor failure but i cant belive your battery AND the starter has failed at the same time .

Good battery fitted first then move on Smile
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-- 997 --
Suzuka


Joined: 11 Jun 2015
Posts: 1122



PostPosted: Thu Mar 08, 2018 8:52 pm    Post subject: Reply with quote

If I'm not driving my car for more than a week I just disconnect my battery although it's a new battery!! I leave the bonnet unlocked when I do and sorted, if by accident the bonnet lock/closed then I attach a small device I made and plug inside the drivers are and unlocks the bonnet. Thumb

J
 
  
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