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

6,845

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 out of 3 people think this is helpful.
233,365

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.

233,365

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

2 out of 2 people think this is helpful.
233,365

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.

2,855

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

2,855

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

295

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

  • Fitting two batteries 14 answers

    Seeing there are lots of problems with battery drain and low voltage Issues could another battery be added and plug in to the charging system, or are these cars to sensitive. Ignoring the space it wi...

    2004 BMW X5 4.8is

    -

    Maintenance & Repair

  • 2001 bmw x5 4.4 e53 won't start. New battery new alternator 4 answers

    I went and had it tinted. Brought it home, left it for a day. Took it out to wash it and got to the end of the driveway before it shut off. Battery light was solid. Changed out the battery. Then th...

    2001 BMW X5 4.4i

    -

    Maintenance & Repair

  • BMW X5 Electrical 1 answer

    About 3 months ago my 2003 X5 security alarm started going off randomly for no apparent reason. The only way to keep it from happening was to leave the car unlocked. Then about 6 wks ago my fob ...

    2003 BMW X5 3.0i

    -

    Maintenance & Repair

  • My BMW 528e is having electric problems and stops running randomly. Do you have any idea what might be wrong? 1 answer

    Recently the BMW 528e that we own has been having trouble staying running, and has been breaking down in the middle of the road. It has been pinpointed to an electrical problem, but that's as far as...

    1988 BMW 5 Series 528e

    -

    Maintenance & Repair

  • DSC and Amber break lights 3 answers

    Driving along and the front right brake will pulse and then the two lights come on DSC and the amber brake light.took to BMW dealer could not find any thing wrong.Lights are gone after restart vehi...

    2001 BMW Z3 2.5i Convertible

    -

    Maintenance & Repair

X5

Looking for a Used X5 in your area?

CarGurus has 16,725 nationwide X5 listings starting at $2,000.

ZIP:

Search BMW X5 Questions

BMW X5 Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,490
#2 Robert Charlson
Robert Charlson
Reputation 660
#3 Asiamah6910
Asiamah6910
Reputation 500
View All

Related Models For Sale

Used BMW X3
358 Great Deals out of 14,011 listings starting at $3,495
Used BMW 5 Series
506 Great Deals out of 15,610 listings starting at $2,499
Used BMW 3 Series
960 Great Deals out of 33,574 listings starting at $1,000
Used Mercedes-Benz M-Class
177 Great Deals out of 5,238 listings starting at $2,980
Used Jeep Grand Cherokee
1,046 Great Deals out of 74,229 listings starting at $950
Used Acura MDX
220 Great Deals out of 18,753 listings starting at $1,495
Used Porsche Cayenne
93 Great Deals out of 5,535 listings starting at $3,999
Used BMW 7 Series
184 Great Deals out of 6,076 listings starting at $2,999
Used Mercedes-Benz GL-Class
185 Great Deals out of 4,292 listings starting at $6,999
Used Land Rover Range Rover Sport
137 Great Deals out of 6,585 listings starting at $6,400

Used Cars For Sale

2017 BMW X5 For Sale
21 Great Deals out of 8,027 listings starting at $48,444
2016 BMW X5 For Sale
33 Great Deals out of 555 listings starting at $32,991
2015 BMW X5 For Sale
38 Great Deals out of 615 listings starting at $31,900
2014 BMW X5 For Sale
145 Great Deals out of 2,064 listings starting at $26,993
2013 BMW X5 For Sale
65 Great Deals out of 1,198 listings starting at $14,400