My 2004 Z4 the battery discharges in about 4 days if not run....Anyone know what is going on??? It's the 2.5i

45

Asked by Feb 10, 2014 at 08:26 PM about the 2004 BMW Z4 2.5i

Question type: Maintenance & Repair

1 Answer

100,295

Have the battery checked, if it tests good then check for a battery draw, disconnect the negative cable and put a test light in between the cable and post, if the light lights bright then there is a draw, first thing to check is the alternator, electrically disconnect it, if the light goes out then you have a bad alternator, most likely a diode went bad, if the light is still bright then you will have to remove the fuses 1 at a time until the light goes out, write down where each fuse goes as you remove them. Be aware that some vehicles have a parasitic load that will cause some test lights to just glow not a bright light that glow would be considered normal.

1 of 1 people found this helpful.

Your Answer

BMW Z4 Experts

  • #1
    rjgonzalez
    Reputation
    200
  • #2
    Tom Demyan
    Reputation
    190
  • #3
    Michael Kane
    Reputation
    150
View All

Related Models For Sale

Used BMW 3 Series
1,116 Great Deals out of 32,629 listings starting at $1,000
Used Chevrolet Corvette
290 Great Deals out of 20,736 listings starting at $2,990
Used Mercedes-Benz SLK-Class
60 Great Deals out of 1,184 listings starting at $2,995
Used Porsche Boxster
43 Great Deals out of 1,150 listings starting at $4,500
Used Mazda MX-5 Miata
68 Great Deals out of 4,296 listings starting at $1,900
Used BMW M3
41 Great Deals out of 1,718 listings starting at $5,995
Used Ford Mustang
712 Great Deals out of 38,398 listings starting at $895
Used Porsche 911
129 Great Deals out of 4,974 listings starting at $8,900
Used Audi TT
32 Great Deals out of 846 listings starting at $1,996
Used Mercedes-Benz SL-Class
66 Great Deals out of 2,887 listings starting at $4,500
Used BMW 5 Series
451 Great Deals out of 16,246 listings starting at $1,995

Used Cars For Sale

2016 BMW Z4 For Sale
3 Great Deals out of 72 listings starting at $35,000
2015 BMW Z4 For Sale
6 Great Deals out of 89 listings starting at $25,999
2014 BMW Z4 For Sale
3 Great Deals out of 76 listings starting at $25,991
2013 BMW Z4 For Sale
28 listings starting at $19,999

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.