There are a couple of possiblities here, assuming the replacement alternator checks out ok. Most common, the main feed wire from the back of the alternator to the battery has a problem. In many vehicles there is a fuseable link where the wire attaches to the large starter bolt. (Again, this is not every vehicle.) This could be burned. An easy way to check for this is using a test light, one that you clip to ground then probe a wire to light it up. Ground it, then (carefully so you don't short out the tool) touch the large wire connection at the back of the alternator (with the engine off.) Many Fords use a second large connector on the side of the alternator; two large, same-colored wires are your feed wires. If it doesn't light up, that's your problem. Find the wire break. If this isn't the problem (98% of the time it is), there is the remote possibility that the switched feed wire to the regulator is not getting power. Basically, this tells the regulator that the vehicle is on and it's time to charge. Not a common problem though.
Have the battery checked out. It may have a dead cell and not holding a charge,
Inside the alternator
Try the cables from your battery and alt. Sometimes these can corrode.
old myth, bad for alternator, dont do this..
Try changing the battery.
If the light remains on then the system still isn't charging as it should. Check the plug on the alternator and also that the wires to the alt have a good connection.
my 05' cavalier has a bad alternator problem its charging the battery a little bit then stops and the little power my battery has is drained by the end of the night. I replaced the alternator twice and the battery but still no difference.
you have a short where negative is touching the metal of the car or it is grounded inproperly
It could be an alternator. Check with a mechanic if that is the issue.
?ignition control module/pickup
The regulator is in the engine computer not the alternator.
Sorry to say,but no. The alternator is the device that replaces the power that has been used from your battery.Without the alternator, the battery will get drained and not be able to recharge.
A light is on or a relay is stuck pulling power from the battery.
For most cars there is a separate pulley groove and belt for the alternator and power steering. That way if your alternator belt breaks you could still steer the vehicle.
The computer only resets when the battery is removed. The alternator just charges the battery, so if the battery is left connected when the alternator is replaced, the computer should not reset.
You probably have a bad battery. You probably have a bad battery.
Your belt is correctly tensioned?
Some Ford models had a external voltage regulator. If yours does, replace it.
the battery job is to start the car so the alternator will kick in after the car is running
Bad battery, Parasitic drain.
check alternator belt may be slipping.if the belt isworn or glazed replace it if problems is still there replace alternator.
I have the exact same pproblem with a 1988 tempo, replaced the alternator and battery, still the alternator only reads 5 volts when running. Can't figure it out, do you know of any websites that would have a diagram of the alternator for a tempo?
Check the fuse under the dash that's labeled SP Alt. It supplies voltage to the alternator, so it can produce power. On my 98 it's a 7.5amp
We replaced the alternator on 2 different vehicles. It was around $175 for each.