Battery light stays on

Asked by Tchenley Dec 02, 2016 at 10:14 PM about the 2003 Ford F-150 XL SB

Question type: Maintenance & Repair

I recently purchased a 2003 f150 and it
wasnt charging so bench tested alternator
and battery - both are good, cleaned all
connections replaced fusible link but the
thing still is not charging. I have looked for
the mega fuse without luck.
Any ideas would be greatly appreciated

2 Answers

283,335

So you either have a broken wire in the exciter circuit for the alternator or the computer is just not turning on the charging system, I have seen a few GM models do this but not any Fords, but anytime they involve a computer in a system that has worked fine for decades it really messes things up, so if it is not wiring related then your going to need to have the rig "live data" scanned to see if it is a computer failure.

1 people found this helpful.
64,480

The PCM may control the charging of the battery by the alternator. If that is the problem it will have to be diagnosed by a person who has the ability to read the outputs and signals generated by the PCM, utilizing a laptop with the correct program to read your particular year, make, and model vehicle.

Your Answer:

Sell Your Car Yourself

With a simple, secure transaction.

2003 Ford F-150 XL SB

I have a different car

CarGurus Experts

  • #1
    OJ
    Reputation
    35,910
  • #2
    G A Arne
    Reputation
    15,010
  • #3
    F_O_R
    Reputation
    14,200
View All

Know more, shop wisely

Search

Related Models For Sale

Used Chevrolet Silverado 1500
2,969 Great Deals out of 81,415 listings starting at $2,950
Used GMC Sierra 1500
1,284 Great Deals out of 35,668 listings starting at $2,500
Used Ford F-250 Super Duty
913 Great Deals out of 22,780 listings starting at $1,500
Used Dodge RAM 1500
98 Great Deals out of 2,964 listings starting at $1,500
Used Toyota Tundra
797 Great Deals out of 16,781 listings starting at $3,900
Used Toyota Tacoma
890 Great Deals out of 28,811 listings starting at $4,123
Used Ford Mustang
496 Great Deals out of 17,605 listings starting at $995
Used Ford Ranger
278 Great Deals out of 10,660 listings starting at $1,999
Used Chevrolet Silverado 2500HD
490 Great Deals out of 15,659 listings starting at $4,036
Used Chevrolet Tahoe
724 Great Deals out of 16,091 listings starting at $2,695
Used Ford Explorer
1,503 Great Deals out of 37,461 listings starting at $1,950
Used Nissan Titan
284 Great Deals out of 10,509 listings starting at $2,998
Used Chevrolet Colorado
485 Great Deals out of 12,742 listings starting at $2,522

Used Cars for Sale

2021 Ford F-150 For Sale
43 Great Deals out of 22,698 listings starting at $24,426
2020 Ford F-150 For Sale
304 Great Deals out of 8,802 listings starting at $28,160
2019 Ford F-150 For Sale
570 Great Deals out of 12,352 listings starting at $19,777
2018 Ford F-150 For Sale
996 Great Deals out of 22,424 listings starting at $17,999
2017 Ford F-150 For Sale
392 Great Deals out of 7,063 listings starting at $11,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.