Charging system problems

Asked by Apr 14, 2017 at 10:05 AM about the 2005 Ford F-150 XL

Question type: Maintenance & Repair

My battery keeps going down after about  after the engine is shut off for about
36 hours. I have replaced battery, positive and negative battery cables, and
alternator. The problem still exist.

2 Answers

55,415

Either you have a bad battery or there is a parasitic draw on the battery. To measure the draw remove the positive battery cable and connect an amp meter between the positive battery post and the positive battery cable. This will measure the draw. Make sure any under hood lights or interior lights are turned off. To locate the circuit drawing the current you can remove and reinstall one fuse at a time until the draw stops. Then you have found the problem circuit. Once you have found the problem circuit then you examine all of the things in the circuit until you discover the problem. Common sources of parasitic draws are defective alternator, hood light stuck on, glove box light stuck on, interior lights on, stuck relays, etc.

2 of 2 people found this helpful.
3,865

timers and such can raw some juice for up to half an hour so give it that amount of time for problem to show . From memory 50 milli amps or more is too much , or search parasitic draw , let us know what happens .

Your Answer

Ford F-150 Experts

  • #1
    OJ
    Reputation
    9,450
  • #2
    dandyoun
    Reputation
    4,650
  • #3
    tennisshoes
    Reputation
    3,270
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,717 Great Deals out of 175,181 listings starting at $955
Used GMC Sierra 1500
1,178 Great Deals out of 64,912 listings starting at $999
Used Ford F-250 Super Duty
426 Great Deals out of 49,460 listings starting at $1,899
Used Toyota Tundra
699 Great Deals out of 34,411 listings starting at $1,500
Used Dodge Ram 1500
409 Great Deals out of 11,150 listings starting at $1,495
Used Toyota Tacoma
712 Great Deals out of 45,873 listings starting at $2,500
Used Ford F-350 Super Duty
372 Great Deals out of 27,289 listings starting at $3,000
Used Ford Mustang
600 Great Deals out of 39,738 listings starting at $1,988
Used Chevrolet Silverado 2500HD
375 Great Deals out of 30,778 listings starting at $2,500
Used Nissan Titan
289 Great Deals out of 17,675 listings starting at $3,500
Used Chevrolet Tahoe
828 Great Deals out of 42,175 listings starting at $1,987
Used Chevrolet Colorado
353 Great Deals out of 38,382 listings starting at $1,595
Used Ford Explorer
1,267 Great Deals out of 70,072 listings starting at $1,000

Used Cars For Sale

2018 Ford F-150 XL For Sale
4,068 listings starting at $20,645
2017 Ford F-150 XL For Sale
685 listings starting at $18,500
2016 Ford F-150 XL For Sale
9 Great Deals out of 148 listings starting at $15,552
2015 Ford F-150 XL For Sale
15 listings starting at $15,995
2014 Ford F-150 XL For Sale
5 Great Deals out of 109 listings starting at $9,995

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.