Q: 2007 ford explorer changed alternator battery still dying

asked by on

I change my alternator in my 2007 Ford Explorer. Car still keeps shutting off and saying check charging system. I can't find a mega fuse box or a mega fuse and that's the problem and I checked all my fuses underneath the hood in the capsule and all seem fine

My car has 187000 miles.
My car has an automatic transmission.

Your charging system is controlled by the engine computer and if computer is not able to control the alternator the vehicle charging system will not operate. You may need to use an alternator from a dealer or authorized dealer part remanufacturer. Some aftermarket alternators are known to not work in these vehicles. Have the computer scanned for codes to see if it has codes stored that may need serviced first and then test computer ability to control alternator using the WDS scanner or equal. You may have a computer failure to control the alternator.

Was this answer helpful?

A number of things things may affect the alternator not pushing current to the battery. The main feed wire to the battery is protected by a series "fusible links" in the line from the alternator through the junction box, to the battery. If that link opens, it should be visibly discolored or burnt-looking. Beyond this, there are two more fusible links, in series with each other, which connect to the junction of the first at the battery junction box, behind the battery. A short-circuited alternator can burn out any or all of these fuse links. They consist of a short length of wire several inches long, coated with special insulation. These are not "pull and replace" type fuses as you may be used to seeing. These are permanently wired-in. If blown, they must be cut out with a new link soldered in.

Open the cover of the fuse box; at the left end (front of vehicle) there is a nut holding two terminals which have the fuse links leaving the terminals downwards, and away. One is a thick red wire leading directly to the + battery terminal. The main link should be built into this. There should be a fuse in the vehicle fuse block on the driver’s side, fuse 21, 5 Amperes, which feeds the voltage regulator. This also activates the warning lamp. If that fuse is blown, the alternator will not charge, so you will want to check this first. If this fuse is blown, and it blows upon replacement, somewhere a short circuit exists. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your charging system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 2007 ford explorer changed alternator battery still dying

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: i need a alternator

Hello, thank you for writing in. You are correct in thinking that your charging system has failed. This is very likely the situation at hand. With that being said, you should still have your battery tested. Typically this is a...

Q: Dash lights are out on my Ford Ranger.

Check the ground wiring under the dashboard to see if it is loose. A loose or broken wire will cause electrical issues with the dash lights and cigarette lighter to not work. If you need further assistance with your electrical...

Q: I changed my battery but light still on also dash still says charging failure

Hi Brian. Thanks for contacting us today. Sometimes when a battery light is initially triggered, an error code is stored in the ECU and will require a professional mechanic to complete a warning light inspection to remove. However, it's also...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...