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Windy101
Silverstone


Joined: 05 Jun 2015
Posts: 111



PostPosted: Mon Jan 09, 2017 12:19 pm    Post subject: Re: Battery drain - need Auto electrician Reply with quote

jimC2 wrote:
I'm experiencing a drain on my battery which occurs when the car is left for 2-3 days without use and proving difficult to identify what's causing it. Local garage has checked major components/likely culprits but can't seem to get to the core problem and was wondering if anyone could recommend a good Auto electrician in Central Scotland. Thanks.


Brian Miller Motors on Lanark Rd in Edinburgh may be worth a call. He is a well established Porsche specialist who works in conjunction with an Auto Electrician for tricky electical problems.
 
  
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Harv
Suzuka


Joined: 18 Sep 2014
Posts: 1074



PostPosted: Mon Jan 09, 2017 5:48 pm    Post subject: Reply with quote

Doesn't the ign switch kill the power at the accessory socket/cig lighter? I thought that was fairly normal.

As far as I'm aware the alternator should kick out a constant voltage, say 13.8v-14.5v (on 900rpm idling) regardless and that should be easily measurable with the engine running (make sure there's no other loads turned on/lights/stereo etc).

There is a clutch on the alternator pulley and I have heard of these failing, remove the aux drive belt and it should be apparent when spun by hand if this is duff (slipping in normal drive direction) or not.
 
  
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3343
Location: Sussex


PostPosted: Mon Jan 09, 2017 8:25 pm    Post subject: Reply with quote

Turn on all loads .. lights , heated screen etc etc and test at battery .. should be 13 volts if much less than this or just battery voltage and the alternator is failing ..

Alternator faults show up more if under a load .
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Gurmot
Trainee


Joined: 23 Jun 2016
Posts: 62



PostPosted: Mon Jan 09, 2017 8:39 pm    Post subject: Reply with quote

Harv wrote:
Doesn't the ign switch kill the power at the accessory socket/cig lighter? I thought that was fairly normal.
.


Mine is definitely on all the time. I'm curious to learn if this is not right...
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July 2002 C2 Tiptronic with M030.
 
  
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3343
Location: Sussex


PostPosted: Mon Jan 09, 2017 9:02 pm    Post subject: Reply with quote

Gurmot wrote:
Harv wrote:
Doesn't the ign switch kill the power at the accessory socket/cig lighter? I thought that was fairly normal.
.


Mine is definitely on all the time. I'm curious to learn if this is not right...


I think it was the case that early 996 had an ignition based cig lighter and later ones was permanent .. think we used to rewire them to be permanent .. but going back a lot of years now so not 100% on this .
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Gurmot
Trainee


Joined: 23 Jun 2016
Posts: 62



PostPosted: Fri Jan 13, 2017 6:35 pm    Post subject: Reply with quote

Update. I made a J shaped pipe from a bit of small bore central heating copper pipe and used it to blow out the back of the alternator (having seen various posts about brush wear on voltage regulators and wondering if there could be current leaking across the alternator/regulator). I'm not saying this was the issue but the voltage has been much more stable for the last few days and not dropped below 13.4v even on a long run.

The other suspect is corrosion in the positive cable running from the alternator/starter/jump start post but I will keep monitoring things and see how it goes.

Voltage sits at 12 / 12.2 in the morning before I start the car. Even afte standing for a couple days. Ok for now.
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July 2002 C2 Tiptronic with M030.
 
  
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Gurmot
Trainee


Joined: 23 Jun 2016
Posts: 62



PostPosted: Thu Jun 15, 2017 5:15 pm    Post subject: Reply with quote

Another update with the solution.

I bought a replacement "Y" cable, the one that runs from the alternator to the starter and positive charging post. I also replaced the voltage regulator whilst the alternator was out.

The car now runs at just under 14 volts according to the dash voltmeter, and drops a bit on a long run. Importantly, it now holds a good charge after sitting for a few days and the starter is noticeably faster at cranking.

I did notice that one of the connections on the regulator was not very tight so this could have been the problem but the Y cable crimps were showing signs of corrosion so this was probably the main factor.

Anyway, if you have low voltage, slow cranking and/or apparent battery drain I would look hard at the above.

Cheers - Simon thumbsup
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