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Old 12-17-2009, 01:16 AM   #1
Dado 540
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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
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Old 12-17-2009, 01:20 AM   #2
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Battery good? My GF's car was doing that and the battery was going bad.
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Old 12-17-2009, 01:22 AM   #3
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Hmm

Do the lights go brighter when you give it some gas? Like rpm?
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Old 12-17-2009, 01:24 AM   #4
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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.
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Old 12-17-2009, 01:26 AM   #5
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^ 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.
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Old 12-17-2009, 01:26 AM   #6
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Hmm

Do the lights go brighter when you give it some gas? Like rpm?
Yes they do
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Old 12-17-2009, 01:29 AM   #7
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^ 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.
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Old 12-17-2009, 02:19 AM   #8
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I would test the alternator first. Just curious what kind or battery is it?
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Old 12-17-2009, 01:11 PM   #9
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Just did the alt. at 160k...I had dimming lights at idle but no other symptoms until the battery light came on one morning.
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Old 12-17-2009, 03:37 PM   #10
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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.
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Old 12-17-2009, 05:56 PM   #11
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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.
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Old 12-17-2009, 09:25 PM   #12
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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.
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Old 12-17-2009, 10:07 PM   #13
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battery/alternator
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Old 12-17-2009, 11:20 PM   #14
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My guess is battery if you're maintaining 14v at idle.
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Old 12-17-2009, 11:35 PM   #15
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Quote:
Originally Posted by Dado 540 View Post
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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