what would make my battery light blink randomly?

Asked by Oct 25, 2013 at 08:08 PM about the 2005 BMW X5 3.0i

Question type: Maintenance & Repair

Two days ago the battery light in my 05 BMW X5 started flashing like it had a loose
connection. The next day came on solid and after about five miles dash said'engine fail
safe mode" and shut down. Coasted off the road and tried restarting, key did nothing in
the start position. had it towed home thinking it was just an altenator. Before replacing
it, i tried starting it several times and the engine only turned over twice out of many
attempts.Tried taking off the negative battery cable over night and charged the battery
at the same time. today tried starting it again and only the miles outside temp and
"key in the ignition lock" displayed. No gauges or lights lit up like they normally would.
Checked the fuses, none blown, but did find a few "engine control" fuses to only have
2.5 volts. Didnt seem right to me but im not sure what they are acutally supposed to
be. Tried scanning it but scanner would not link up. What can i look for to possibly
solve this problem on my own?

8 Answers

7,105

We own an X5 for a short time due to the number of electrical issues. I would tell you to have a BMW professional look at it before you randomly try to fix it and cause further (read more expensive) damage by accident.

3 of 3 people found this helpful.
250,445

If the battery is week, you will get some weird electrical issues such as what you are experiencing. How old is the battery? I know you put it on a charger, what is the voltage? If it is over 5 years old, get a new one. See if the issues go away.

250,445

http://www.bimmerfest.com/forums/showthread.php?t=264726

2 of 2 people found this helpful.
250,445

But a blinking light is always indicative of a failing alternator. Put a voltmeter across the battery terminals and check, with the engine running, for around 13.85 volts. If it drops below 13V you most likely need an alternator.

I cant even get it to turn over. key in the on position doesnt even act correctly.

2,945

A battery light always links to a bad alternator. You will have to be sure the battery is in good condition first even if you need to test it outside the vehicle. But this doesn't mean the problem is solved, when a bad alternator is found the battery gets damaged or viceversa

2,945

BMW vehicles are very high tech and use a lot of electronics so voltage is very important

325

bring the Car to an authorised BMW Dealer.. Otherwise, you could be looking at big repair bills from compounded electrical failures

Your Answer

Add photo

Related Questions

  • what would make my battery light blink randomly? 8 answers

    Two days ago the battery light in my 05 BMW X5 started flashing like it had a loose connection. The next day came on solid and after about five miles dash said'engine fail safe mode" and shut down. ...

    2005 BMW X5 3.0i

    -

    Maintenance & Repair

  • Battery red light on - battery not charging 3 answers

    I own a 2003 X5, 3.0 l. Yesterday I drove to the store (4 miles from home) and after getting back into the vehicle it would not start. I jump-started it and after getting back home I noticed the red...

    2003 BMW X5 3.0i

    -

    Maintenance & Repair

  • My BMW X5 after replacing the battery would not lock the door with remote! 7 answers

    After pressing the key the car is behaving strange. The all windows go down and most importantly the door would not lock. Menage yesterday to lock manually bit now even that is not working, key is n...

    2006 BMW X5 3.0i

    -

    Maintenance & Repair

  • change of battery 1 answer

    It looks I need a new battery for my BMW X5. I am aware how sensitive their electrics are, that is I am concerned how to go about changing the battery and not damaging ECU and resetting the system! ...

    2006 BMW X5 3.0i

    -

    Maintenance & Repair

  • How do I get into my BMW X5 3.0? Battery is super dead and I can't get into it. 2 answers

    I had surgery and my truck has not been driven for a few months. My driver door latch is broken and since the battery is dead, I can't unlock any of the doors with my key fob. Any ideas other than bus...

    2002 BMW X5 3.0i

    -

    Maintenance & Repair

X5

Looking for a Used X5 in your area?

CarGurus has 13,243 nationwide X5 listings starting at $2,200.

ZIP:

Search BMW X5 Questions

BMW X5 Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,660
#2 Robert Charlson
Robert Charlson
Reputation 710
#3 Asiamah6910
Asiamah6910
Reputation 560
View All

Related Models For Sale

Used BMW X3
279 Great Deals out of 12,181 listings starting at $2,900
Used BMW 5 Series
497 Great Deals out of 16,549 listings starting at $2,000
Used BMW 3 Series
1,006 Great Deals out of 31,263 listings starting at $1,000
Used Mercedes-Benz M-Class
196 Great Deals out of 5,704 listings starting at $2,500
Used Jeep Grand Cherokee
919 Great Deals out of 70,240 listings starting at $500
Used Porsche Cayenne
119 Great Deals out of 4,694 listings starting at $3,999
Used Acura MDX
341 Great Deals out of 17,815 listings starting at $1,900
Used BMW 7 Series
181 Great Deals out of 6,040 listings starting at $900
Used Mercedes-Benz GL-Class
136 Great Deals out of 3,621 listings starting at $7,890
Used Land Rover Range Rover Sport
163 Great Deals out of 5,563 listings starting at $5,995

Used Cars For Sale

2017 BMW X5 For Sale
34 Great Deals out of 5,475 listings starting at $45,999
2016 BMW X5 For Sale
12 Great Deals out of 394 listings starting at $32,300
2015 BMW X5 For Sale
45 Great Deals out of 818 listings starting at $27,895
2014 BMW X5 For Sale
139 Great Deals out of 1,801 listings starting at $25,890
2013 BMW X5 For Sale
40 Great Deals out of 789 listings starting at $14,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.