[W126 Coupe] Electrical Problem - bad ground?

[Dawid Loubser]

Thank you markus, I will do that. Most fuses have been replaced in  
the past
2 years, so I doubt it's that, but it's worth a look. The Voltage  
Regulator on the
alternator sounds a better bet - but would that not preclude the  
battery from being
charged properly? As I said, it's guaranteed that the battery is  
definitely being charged,
she starts fine every time within less than a second of turning the  
starter motor.

Excuse the ignorance, but where is the best place to test voltage on  
the running car?


On 19 Jun 2008, at 12:34 nm., Markus Meyer wrote:


> David,

>

> Just to be sure, I'd check voltage anyway - first with car off to  

> test resting voltage of the battery, then with car running to test  

> the alternator output.  I had something similar on one of my SELs  

> and the voltage regulator on the alternator was bad.  Replaced that  

> and all is well.   If both those test prove fine, the next thing  

> I'd do is start checking fuses, or possibly replace them all if you  

> don't know the last time it was done.  Lots of electrical gremlins  

> have been solved by swapping fuses with the newer style ones,  

> especially if what you have in there are originals.

>

> Markus Meyer

> mfm at meyerprobateproperties.com

> www.meyerprobateproperties.com

> Meyer Probate & Properties, LLC

> 484-919-9762

>

> -------- Original Message --------

> Subject: [W126 Coupe] Electrical Problem - bad ground?

> From: Dawid Loubser <dawidl at solms.co.za>

> Date: Thu, June 19, 2008 3:14 am

> To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

>

> Hi All,

>

> My SEC started developing a subtle but strange problem a couple of

> days ago (it may have co-incided with

> the attempted theft of my vehicle two weeks ago, but let's not go

> there - suffice it to say that I live in

> South Africa, crime capital of the crime continent of the world).

>

> When I step on the brake pedal, the headlights and interior lights

> dim ever so slightly. Even when the turn signal

> is activated, all lights go slightly dimmer in tune with it. This is

> a subtle problem, but it worries me.

>

> My car starts fine, every time (fairly new battery) and the low

> voltage warning light in the car does not light

> up. What could the problem be? I was thinking of taking the car to an

> auto electrician, but I'd first of all

> give it a go myself if you have some insight for me. I can't imagine

> this being an alternator problem, as

> then my battery would be running down - but for more than a week like

> this, I have not had any problems

> starting my car.

>

> thank you,

> Dawid

>

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