Alternator not charging battery

Are you talking about the little brown wire

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

Alright just making it clear, thanks!

What is that wire for?

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

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

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

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

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.

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

Did you ever figure this out cause I'm have same problem

Me too I am stumped

same here

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.

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

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

Check the voltage regulator

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

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

My problem was the cylinder was not hooked up right

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.

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

fixed it thanks alot

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?

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.;

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

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.......

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

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.

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

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

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

Same problem here, number 11 fuse ended up the problem

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

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

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

Did you find the problem?

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?

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

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

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”)

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

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

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

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.

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!

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?

Wanted to add on to 'Papasnook', under that box. There is an inline fuse, that must feed back to let the alternator and let it know we are getting juice, that 20 amp was barely broken - but broke on 98 Ford F-150, couldn't tell at night, but when we went back a second time after changing the alternator, charging the new battery. We found that one broken. Make it easier to see, here is new picture of that 'location' for anyone else. Recommend replace this fuse first, before, Battery, Cables, Max fuses, alternator. - Hope this helps a bit more. Have issues with the #11 fuse comments above - this main box, didn't have fuse in number 11? Wonder if they moved it to that link?