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-   -   Lights dimming slightly (http://www.maxbimmer.com/forums/showthread.php?t=128223)

Dado 540 12-17-2009 12:16 AM

Lights dimming slightly
 
Hey i've noticed that the interior lights and even the headlights would dim slightly when i apply the brake. This would also happen sometimes when im idling.

Any thoughts? Alternator

hustler 12-17-2009 12:20 AM

Battery good? My GF's car was doing that and the battery was going bad.

lvan 12-17-2009 12:22 AM

Hmm

Do the lights go brighter when you give it some gas? Like rpm?

Dado 540 12-17-2009 12:24 AM

I have replaced the battery 2 years ago. Haven't had any problems,but im gonna have to check it. E39 are sensitive to the battery that is not fully charged.

Im reading up on this on other forums and people are suggesting General Module, Voltage Regulator, Alternator, Battery...

I forgot to mention that RPMs tend to dip on a rare occation.

hustler 12-17-2009 12:26 AM

^ Oh, is that all?

I hate electrical issues. My RPM hunts a little at idle too, only after a long (couple of hour) drive though.

Dado 540 12-17-2009 12:26 AM

Quote:

Originally Posted by lvan (Post 1374984)
Hmm

Do the lights go brighter when you give it some gas? Like rpm?

Yes they do

Dado 540 12-17-2009 12:29 AM

Quote:

Originally Posted by hustler (Post 1374987)
^ Oh, is that all?

I hate electrical issues. My RPM hunts a little at idle too, only after a long (couple of hour) drive though.

Yup you know how it is. Everything is interconnected. If you dont know your stuff thats how shops rip you off.

lvan 12-17-2009 01:19 AM

I would test the alternator first. Just curious what kind or battery is it?

carjoe 12-17-2009 12:11 PM

Just did the alt. at 160k...I had dimming lights at idle but no other symptoms until the battery light came on one morning.

MLue1 12-17-2009 02:37 PM

Quote:

Originally Posted by Dado 540 (Post 1374986)
I have replaced the battery 2 years ago.

The E39 draws alot of amps, if the replacement battery was too small without enough reserve, they seems to go bad fast. Take it to Canadian tire and have them check it before doing anything else.

Max_VQ 12-17-2009 04:56 PM

Measure the battery voltage with the car running and lights on & off. The voltage should be > 14 volts.

If it is less, I would suspect the alternator. Normally batteries last 3-4+ years.

Dado 540 12-17-2009 08:25 PM

To answer Ivans question, the battery is Eliminator from Canadian Tire

Max i have ran the onboard test while driving rating ranges from 13.5V-14.1V
While parked/idling rating is 14.0V (It might dip to 13.9 but back to 14.0)

Im still gonna take it to Canadian Tire to have it checked out as Mark suggested.

propr'one 12-17-2009 09:07 PM

battery/alternator

carjoe 12-17-2009 10:20 PM

My guess is battery if you're maintaining 14v at idle.

myndgone 12-17-2009 10:35 PM

Quote:

Originally Posted by Dado 540 (Post 1374982)
Hey i've noticed that the interior lights and even the headlights would dim slightly when i apply the brake. This would also happen sometimes when im idling.

Any thoughts? Alternator


Mine used to do that once in a while too...

And oh....Thanks for ripping off my sig ;)


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