14 Volts with engine running

Just your normal general chatting in here..

Moderator: Moderators

Post Reply
User avatar
Welly
The moderator formally known as Welton
Posts: 14597
Joined: Tue Jan 10, 2006 1:52 pm
Location: East Midlandfordshire

14 Volts with engine running

Post by Welly » Tue Aug 21, 2018 1:58 pm

Our Citroen has popped its high-level LED brake light (the third brake light).

I've got voltage at the 2-pin connector plug but when speaking to one of the mechanics next door at work he said 14 volts is "too high" for a car :? obvs I didn't want to get into a debate about it there and then.

My understanding has always been a healthy voltage of around 13.7 to 14.5 with the engine running was a good indicator for most cars.

Weirdly the LED light is stamped 13.5V which he said was a maximum, can't imagine an extra 0.5 volts more would hurt but hey.

The main dealer wants £137.00 for the part, I've removed the old one so easy to fit myself but don't want to 'pop' the new one. I've also found a spare replacement used one (in Italy :roll: ) you would not believe how many Pug/Cit models use this same brake light.

There's no other issues with the electrics although it does blow maybe a couple of rear filament lamps per year but some cars do that don't they.

Any advice welcomes.
Cars in my care:

2005 Volvo S40 T5 a bit pampered
2010 Citroen C4 1.6 HDi turbo de' explosions
2010 Renner Twingo refreshingly simple

caprixpack
2.0 16v
Posts: 141
Joined: Sun Mar 11, 2018 5:00 pm
Location: Cumbria

Re: 14 Volts with engine running

Post by caprixpack » Tue Aug 21, 2018 2:11 pm

I'd say try a different mechanic. Most cars charge up to around 14.5v. My gtx is usually around 14.4 and my 34 year old 924 is between 13.5 to 14.2 depending on engine speed.
1984 924 2.0 n/a crystal Green - The daily
2005 VW Passat tdi 130 Highline, now 170bhp & 290ft/lb
2000 Peugeot 406 2.0 hdi - stood for 4 years, fresh mot and mostly working.

User avatar
Welly
The moderator formally known as Welton
Posts: 14597
Joined: Tue Jan 10, 2006 1:52 pm
Location: East Midlandfordshire

Re: 14 Volts with engine running

Post by Welly » Tue Aug 21, 2018 2:18 pm

Yeah, that's what I thought, perhaps 13.5v is the minimum for the LED light so it doesn't flicker or something.
Cars in my care:

2005 Volvo S40 T5 a bit pampered
2010 Citroen C4 1.6 HDi turbo de' explosions
2010 Renner Twingo refreshingly simple

User avatar
steve_earwig
Moderator
Posts: 18944
Joined: Thu Oct 04, 2007 6:09 pm
Location: Jastrebarsko, Croatia http://www.jastrebarsko.hr/lokacija/

Re: 14 Volts with engine running

Post by steve_earwig » Tue Aug 21, 2018 4:15 pm

Is it possible to change the individual LED's? I think there's a farmerpug youtube vid replacing one on, er, something.
Unskilled meddling sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - sold but being very well looked after.
1991 Yamaha TDM850 - fuel leaks galore!
2008 Toyota Recall4 2.0 VVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
1953 Matchless G3LS - It's alive!!

User avatar
Welly
The moderator formally known as Welton
Posts: 14597
Joined: Tue Jan 10, 2006 1:52 pm
Location: East Midlandfordshire

Re: 14 Volts with engine running

Post by Welly » Wed Aug 22, 2018 8:43 am

The light unit is one of those 'once only' manufactured items; two halves bonded together with god knows what and produces a "I dare you to pry a bit more" crackling sound when trying to tease the joint open even just a bit.

I just know the whole thing will shatter apart or I'll stab myself horribly trying. Or both.

Luckily* the Turd Brake Light does not form part of the MOT if it's not there :? if it is there then it need to work. I asked my MOT tester this. I don't really want to leave the hole where it used to be so I think I'll try the second hand unit.
Cars in my care:

2005 Volvo S40 T5 a bit pampered
2010 Citroen C4 1.6 HDi turbo de' explosions
2010 Renner Twingo refreshingly simple

User avatar
steve_earwig
Moderator
Posts: 18944
Joined: Thu Oct 04, 2007 6:09 pm
Location: Jastrebarsko, Croatia http://www.jastrebarsko.hr/lokacija/

Re: 14 Volts with engine running

Post by steve_earwig » Wed Aug 22, 2018 1:41 pm

https://www.amazon.co.uk/Dremel-3000-15 ... rds=dremel

It's already borked, can you make it any worse? (besides impaling yourself on shards of plastic..)
Unskilled meddling sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - sold but being very well looked after.
1991 Yamaha TDM850 - fuel leaks galore!
2008 Toyota Recall4 2.0 VVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
1953 Matchless G3LS - It's alive!!

User avatar
Welly
The moderator formally known as Welton
Posts: 14597
Joined: Tue Jan 10, 2006 1:52 pm
Location: East Midlandfordshire

Re: 14 Volts with engine running

Post by Welly » Wed Sep 05, 2018 8:49 am

In the end I managed to bag a bargain from ebay, located in Lithuania :shock: I made an offer for £5.00 off the asking price and had one delivered for £29.00 all in :D

Fitted it last night and it works perfect!
Cars in my care:

2005 Volvo S40 T5 a bit pampered
2010 Citroen C4 1.6 HDi turbo de' explosions
2010 Renner Twingo refreshingly simple

PeterN
3.0 24v
Posts: 1419
Joined: Sun Mar 04, 2012 7:04 pm
Location: Charmouth, Dorset

Re: 14 Volts with engine running

Post by PeterN » Wed Sep 05, 2018 9:50 am

That's the way to do it, or the scrap yard. 14.4 volts is about the norm, if you have bulbs going at that voltage they are either of poor quality or subject to vibration.

Peter

Post Reply