Alternator not charging battery

1,880

Asked by DylanPackard Mar 01, 2016 at 06:13 PM about the 1995 Ford F-150

Question type: Maintenance & Repair

Alternator is good and the battery is good but
there's something not letting it charge I've had both
check and check them myself check all the fuses
no wires but yet it will shut off about a mile down
the road

48 Answers

223,685

The car is shutting off because it had ben running off the battery until there is not enough juice left in the battery. So ya, gonna have to check the wire that runs to the battery from the alternator & the small wire that plugs into the alternator. Lot of times that plugin will go bad.

83 people found this helpful.
Best Answer Mark helpful
223,685

That plugs into the alternator. That plugin can go bad, they make a replacement.

25 people found this helpful.
223,685

It runs power to the voltage regulator. Turns on the alternator so to speak.

25 people found this helpful.
1,880

I changed that wire and all the other wires and plugs to the alternator but its still draining the battery can't other ideas

25 people found this helpful.
223,685

Is the alternator working, or is something draining the battery with the key off? You changed you terminology.

18 people found this helpful.
1,880

No battery stays changed with key off but its drains like crazy then stays at 10.91

29 people found this helpful.
223,685

Ok thats because the alternator is still not charging and the car is just running off of the battery juice. So, you know the alternator works. It has to be in the wiring some where. I know on my vehicle there is a fuse for the air bag, and for the gauges. If one of these are not in place, my vehicle will not charge. Otherwise without being there to see, I don't know. But I will be thinking of anything all day for you.

51 people found this helpful.
1,880

Well I dontbknow if this will help but the battery light by the gauges is on and the check engine light will come on and off. But thanks for helping me

20 people found this helpful.
500

I had the same problem after 3 alternators,testing every wire even the fuse. When I replaced the 20 amp fuse I found that it wasn'tmaking a connection,so I bent the tabs closer and my charging system started working.

50 people found this helpful.
22,630

What 20 amp fuse? What is it called in the fuse box?

64 people found this helpful.
140

Starter is grouding out if you got batt and alter checked take get it checked

14 people found this helpful.
320

my battery is not charging like it should. it just died on me coming home had to be jumped and then all my gauges started going haywire, however i have battery charger on it now it is way low

17 people found this helpful.
320

can anyone tell me whats the problem here i have a 1996 f150 truck

15 people found this helpful.
460

I have a 97 F150. Replaced the alternater and battery was not getting charged. Looked all over motor, starter wires, under the dash. Found the big black battery terminal fuse box on passenger side of engine compartment. Inside the cover were two large fuses and under those was a smaller fuse inside a clip cover. The smaller fuse is a standard 10 amp auto fuse. It was blown by the alternater. Replaced the fuse and the problem was solved.

46 people found this helpful.
390

There is 2 50 amp fuse under the black caps buy the starter soilanold on fire wall passenger side it will be the bottom one that is bad I have fix many of them

32 people found this helpful.
110

Starter solinoid and half of ignition system is brand new. Alt is good and bat is brand new. Black 20 amp is clicking when turning ignition. Could this have anything to do with issue?

11 people found this helpful.
230

Any update? 2003 F150 New Battery, Alternator good.. NO battery light on dash. Truck will run fine until battery drains.... multiple shops including Ford Dealer. Ford Dealer gave up after 3 weeks... had to pay $200 for them to find nothing...and had me take truck back.;

23 people found this helpful.
22,630

Check voltage drop on red cable from battery to alternator and also do an alternator ripple test. Could be a bad diode in your alternator allowing voltage to go in the direction of the alternator instead of towards battery. My guess it is one of these 2 possibilities

19 people found this helpful.
280

97 ford f150 new alternator battery n starter something is draining battery alternator isn't charging checked fuses under hood they are all good just stumped on what it could be any suggestions.......

28 people found this helpful.
130

92 ford f250 custom 351w new alt new battery new terminals truck runs but dies when the battery dies. Any ideas?

13 people found this helpful.
250

I just got done working on a 99 F150 same issue replaced Alt. and battery, no charge. Found fuse number 11 (alternator field) was blown. Replaced fuse all is well.

25 people found this helpful.
210

Same thing with my 96 4.9 4x4 f150 I'm goin nuts man... Did u get it figured out?

7 people found this helpful.
210

Were you talking about the solenoid ? the like black thing on the passenger side of the engine compartment right? cause I'm goin through hell if you could take a pic of yours n how u got it hooked n to 352 451 3931 my name is Justin thnx man

14 people found this helpful.
160

I just did the same in a 99 f150 turned out to just be the #11 fuse in fuse box under the hood think its a yellow one

15 people found this helpful.
120

when y'all say #11 fuse, which one are you referring to

12 people found this helpful.
80

where can I get a replacement connector for the wire on the alternator

8 people found this helpful.
140

I got a 99 F150 4.6 I had the alternator and battery check I can put jumper cables on it will crank run good but when I take the jump cables off the truck dies would you please show me where the charging relay is

14 people found this helpful.
40

yea 1998 e150 same thing number 11 is good no idea prob get junk yard alternator tommorow i would think battery voltage would drop below 12.2 if alt was bad stays running like that diode ? voltage reggulater? alternator seems to be throwing juice when un hooked from car?

4 people found this helpful.
50

Put a new alternator put a new battery change the terminal poses looked at all the fuses but One found a fuse on the passenger sideOn the inside of this box

5 people found this helpful.
80

New alternator new battery new pig tail, checked and repaired other connections. I checked every fuse. My 150 runs till battery dead. I have a bad blower motor relay. Could this be a possibility? Going nuts trying to fix this thing

8 people found this helpful.
80

Had an issue with an 18mth old 2017 F150, battery kept draining. Took to ford, replaced alternator and happened again. Almost a week in shop and the wire harness was pinched and shorting out. They had to replace the harness, would have been a $2K job, but warranty covered. My concern is that it’s a design flaw and going to happen again without warranty. Anyone else experience or have an upgrade solution? I do have a level kit (2.5”)

8 people found this helpful.
80

I got a 99 f150 its gotta be a short or something but the altornator wont charge the battery. I found it was a 20 amp fuse in the man fuse box poped a new one in fixed the problem. Until i hit the gas it blows the fuse everytime i cant figure out what it is. Plz help text me a 2314084154 if u have answers

7 people found this helpful.
20

Jcarter3134 I have the same problem on a 2002 ford f150. Did you find the cause of your problem?

2 people found this helpful.
80

Yea it was an internal short and the voltage regulator went out in my alternator

1 people found this helpful.
80

2004 f150 supercrew, battery light came on, and in 2 hours instrument panel went crazy and started running rough. Pulled over, took battery out and charged, then started up but not charge. Replaced alternator, still wouldn’t charge. No fuses were Blown. Tested continuity of plug, it was fine. Put dielectric grease on connector, started working. Replace the connector, it wasn’t squeezing enough for a good connection.

8 people found this helpful.

after changing 3 alternators and 2 batteries (all under AZ warranty) the #11 20 amp fuse finally made the light go away and brought the charging up to 14.7. hanks Everyone!

10

The #11 shows to be a 30 amp for power running board mots or a 10 amp for the instrument cluster. Maybe I am looking at the wrong fuse box. Is it the Power distribution box or the passenger compartment fuse panel?

1 people found this helpful.

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