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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1276
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Fri Aug 16, 2019 6:25 pm    Post subject: Voltage gauge accuracy Reply with quote

How accurate is the voltage gauge?
Took a trip today and since having alternator issues on another car was watching the gauge and it was only hovering over 12v, dependant on how much stuff I had running. not got a voltmeter in the car to check what im actually getting, but what does your voltage gauge read ?
_________________
1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7183
Location: Brighton


PostPosted: Fri Aug 16, 2019 6:35 pm    Post subject: Reply with quote

Not very accurate .. it might indicate a fault though if on 12 volts .. buy a cheap volt meter ( £9 ) and check at the battery just in case .


https://www.amazon.co.uk/DIGIFLEX-Testing-Digital-Multimeter-Voltmeter/dp/B003NEGZLS/ref=sr_1_10?keywords=volt+meter&qid=1565980415&s=gateway&sr=8-10
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Thank you all so Very much .

She's not going until july 2020 though .



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yo_clarkie
Spa-Francorchamps


Joined: 14 Feb 2012
Posts: 306



PostPosted: Fri Aug 16, 2019 9:14 pm    Post subject: Reply with quote

https://www.aliexpress.com/item/32974429232.html?spm=a2g0o.productlist.0.0.611ec9aauzmQ7w&algo_pvid=b8b45329-deec-40f0-845f-1536f954d186&algo_expid=b8b45329-deec-40f0-845f-1536f954d186-25&btsid=121f0a0a-9ca4-456a-b299-becdff871ce5&ws_ab_test=searchweb0_0,searchweb201602_8,searchweb201603_52


have one a bit like this in mine, it also charges the phone
_________________
2003 996 C4S in Silver, Manual, PSE, new in UK, now in New Zealand
Mods so far: K&N induction, Kenwood Navigation and AMP, LN Engineering IMS, fully replaced suspension with new factory parts
 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1276
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Sat Aug 17, 2019 5:42 am    Post subject: Reply with quote

Thanks guys, it started again fine last night when I went out for dinner, I was having anxiety issues after being stranded last weekend driving the heritage vehicle with duff electrics.
Have several voltmeters at home so will check when I get back, did my anxiety no good when I realised I had taken the jump leads out Of The frunk for the other car last week..
_________________
1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16682
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Aug 17, 2019 10:33 am    Post subject: Reply with quote

Mine reads around 11.5v when engine is not running (my battery is over 6 years old and only an S3) and up at 14v when running.

As a quick easy check, pull up against a wall in the dark, switch your engine off, put your headlights on. Start the car and see how much brighter they go with the engine running.
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2000 Manual 996 C4 Arctic Silver Convertible


 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1276
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Sat Aug 17, 2019 5:01 pm    Post subject: Reply with quote

So took some readings as soon as I got back, the voltage gauge reads about half a volt lower than it actually is.
Measured with voltmeter, Hot, when I just got back after 2hrs on the motorway, at the battery, 12.5v engine off hood open. Just started 12.6v hot, 12.7 back in the engine bay off the jump terminal. That's not charging though at that voltage, but is it a clever system that senses when Batt needs charge?

Cold this morning it read 14v just after I started it up from the dash gauge which held for a minute or so before dropping to 13.5 ish. Later in the motorway it was reading about 12.5 on the dash, but dash reads about half a volt lower than what's seen at the battery.

Just seems a bit weird? Not run out of electricity ever but it's not a new battery by any means and it's usually sat on a trickle charger during the week
_________________
1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1276
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Sat Aug 17, 2019 5:07 pm    Post subject: Reply with quote

Obligatory photo, I hadn't actually broken down or sprung a coolant leak..
_________________
1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 



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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7183
Location: Brighton


PostPosted: Sat Aug 17, 2019 5:59 pm    Post subject: Reply with quote

Car hot / running , headlights on , main beam on .. fog lights on radio .. heated seats .. anything electric ..

voltmeter on the battery and not the gauge .. if below 13 volts then your alternator is on its way out .

Cold / hot and a faulty alternator will give different readings .

checks are always done via a separate volt meter .
_________________
.

My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 
  
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