2005 F150 battery question

Asked by Jul 09, 2016 at 11:39 PM about the 2005 Ford F-150 XLT

Question type: Maintenance & Repair

Yesterday while driving home from the office I
noticed that my battery light suddenly lit. Rev
engine it goes out;  no other indication of failure;
that car starts fine runs fine;  all gauges is working
properly.

Tonight driving home I noticed that the battery light
was lit the  battery indicator kept dropping dropping
dropping .   Near home all gauges failed; windows
will not close; lights will not turn on;  all indication
internally  of complete electrical failure .

With a diagnostic tool I determined that battery was
low and not charging
I check battery charge confirmed to be low

How can I determine if it's the alternator or just the
battery ?

6 Answers

26,095

well at the verry least..if you have a volt metter after you charge the battery and start it ceck the voltage of the + - battery...is it 12.5 or more...rev the engine up some...does the voltage increase? if so good... also these checks are free at most places.. called a VAT test..

1 of 1 people found this helpful.
12,625

Check the battery terminals. loose, corroded.

1 of 1 people found this helpful.
68,495

Sounds like a dying alternator. HTH. - Jim

19,150

For the battery light to come on then go off giving you a warning that the alternator has stopped charging so I agree with Jim.

1 of 1 people found this helpful.
19,150

The biggest mistake people make when they see the battery light icon come on is the battery is bad but what it really means is electrical system has stopped charging 95% of time it is the alternator.

1 of 1 people found this helpful.

Here is the BEST and simplest answer I found With The engine operating; Disconnect the negative wire from the battery. If the charging system (alternator) is working properly the engine will not die. If the alternator is bad The engine will stop

Your Answer

Add photo

Related Questions

  • 2005 F150 battery question 6 answers

    Yesterday while driving home from the office I noticed that my battery light suddenly lit. Rev engine it goes out; no other indication of failure; that car starts fine runs fine; all gauges is wo...

    2005 Ford F-150 XLT

    -

    Maintenance & Repair

  • 2000 f150 coil pack question 3 answers

    My 2000 f150 5.4 triton truck has a miss and we looked hooked it up to the computer and it said that the #4 cylinder had a misfire. We took the coil pack out but the bolt will not come out no matte...

    2000 Ford F-150 Lariat 4WD Extended Cab SB

    -

    Maintenance & Repair

  • 2010 f150 transmission question 2 answers

    I have a 2010 f150 4x4 4.6l that shifts fine from 1 to 2 then into drive but when it gets to drive it's like it's in neutral WTF hoping it's a simple fix just dropped a mother load in front differenti...

    2010 Ford F-150 XL 4WD

    -

    Maintenance & Repair

  • 2005 f150 headlights will not come on... 2 answers

    2005 f150 headlights will not come on...Check fuses (good), disconnected battery to reboot, No juice to the plug to the bulb...please advise?

    2005 Ford F-150 XLT

    -

    Maintenance & Repair

  • battery dyng on f150 1 answer

    I have two ford f150's one 2002 and one 2010. battery dying overnight . If I hook jumper cables to it without starting good truck, it will crank. Alternator putting out 14.Volts. when running. Thou...

    2010 Ford F-150 Platinum SuperCrew

    -

    Maintenance & Repair

F-150

Looking for a Used F-150 in your area?

CarGurus has 194,804 nationwide F-150 listings starting at $290.

ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 8,480
#2 dandyoun
dandyoun
Reputation 4,420
#3 tennisshoes
tennisshoes
Reputation 2,950
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,970 Great Deals out of 183,483 listings starting at $1,495
Used GMC Sierra 1500
805 Great Deals out of 68,894 listings starting at $1,800
Used Dodge Ram 1500
417 Great Deals out of 10,964 listings starting at $1,000
Used Ford F-250 Super Duty
331 Great Deals out of 44,727 listings starting at $1,450
Used Toyota Tundra
462 Great Deals out of 34,863 listings starting at $2,500
Used Toyota Tacoma
542 Great Deals out of 43,390 listings starting at $1,995
Used Ford Mustang
736 Great Deals out of 44,993 listings starting at $1,500
Used Nissan Titan
177 Great Deals out of 19,055 listings starting at $3,995
Used Chevrolet Colorado
248 Great Deals out of 27,602 listings starting at $1,000
Used Chevrolet Tahoe
588 Great Deals out of 33,115 listings starting at $1,500
Used Ford Explorer
916 Great Deals out of 65,066 listings starting at $799
Used Ford Ranger
167 Great Deals out of 5,599 listings starting at $1,200
Used Ford F-350 Super Duty
366 Great Deals out of 24,437 listings starting at $2,588

Used Cars For Sale

2017 Ford F-150 XLT For Sale
69 listings starting at $20,999
2016 Ford F-150 XLT For Sale
21 listings starting at $22,184
2015 Ford F-150 XLT For Sale
3 listings starting at $25,000
2014 Ford F-150 XLT For Sale
15 listings starting at $16,675

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.