2003 F250 7.3...... Alternator - Ford Powerstroke Diesel Forum
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Old 02-01-2012, 07:36 PM
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2003 F250 7.3...... Alternator

I the last 5 years I have put 4 alternators on my truck. Original alt. lasted 5 or 6 years then went bad. I replaced it with a Kragen brand, it went bad with-in a couple months. Someone mentioned stay away from them. So I got a NAPA alt. and it went bad with-in a few months. NAPA suggested to put a motorcraft alt on, so I did threw NAPA. The motorcraft alt. lasted 2 months shy of two years. Good thing it had a two year warr. I replaced it with another Motorcraft alt. The alt. is charging but the battery light is still on.

Yes the wires are installed right.

Someone mentioned these year alt's. have problems with the built in regulator?

Could someone tell me what is going on? Why do I keep loosing alt's.? Why is my alt. charging and light still on.

.
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Old 02-01-2012, 07:42 PM
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How Old are the batteries? You have replaced the alternator but you state nothing about the batteries being checked or replaced. Also did those places even bother bench testing the alternators or just warranty them out? Put the batteries on a trickle charge for a few hours each. That means pull the batteries out, hook them to a battery charger one at a time. Put the battery charger on 12volts at 15amps for about 4 hours. Then check the voltage and amperage of each battery. If the amperage is not near the battery rating. Most likely you have found your problem.
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Old 02-01-2012, 08:11 PM
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The alternators were working for a few months, when I noticed the battery light come on I checked it with my volt meter to see if it was working. The alternator I have now shows it charging but the battery light is still on. I have had this alt. on sence Aug. The light hase been on every sence. So far as the batteries, My truck starts up normal as if the batteries were fully charged. I guess I could or should have them load tested.
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Old 02-02-2012, 12:43 AM
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x2 on checking the batteries. I have seen a ton of people replace alternators when it's really a bad battery. I can't believe no one at the parts store told you to do that.
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Old 02-02-2012, 07:59 AM
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Quote:
Originally Posted by dentexcoalroller View Post
x2 on checking the batteries. I have seen a ton of people replace alternators when it's really a bad battery. I can't believe no one at the parts store told you to do that.
Yepp, when you have two batteries hooked in series. You can have a bad battery and the other will work harder. But you would never know you have a bad battery until they are dead.
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Old 02-02-2012, 10:51 AM
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I will check the batteries and let everyone know.
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Old 02-02-2012, 06:21 PM
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Originally Posted by dentexcoalroller View Post
x2 on checking the batteries. I have seen a ton of people replace alternators when it's really a bad battery. I can't believe no one at the parts store told you to do that.
And I have seen a lot of people buy batteries when it was the alternator.

The alternators that I replaced were definitely bad.

The first thing I check when I have a battery go dead is the alternator.

Anyways, I disconnected both batteries to see how many volts were in each, both 12 volts.

Next step...Load test each battery

I will let everyone know the outcome as soon as I do it. It might be a couple days. I live out in the country and sometimes work long days. So I will do it when I can.
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Old 02-02-2012, 06:41 PM
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Originally Posted by bigcountrysg View Post
Yepp, when you have two batteries hooked in series. You can have a bad battery and the other will work harder. But you would never know you have a bad battery until they are dead.
Not to split hairs, but our batteries are wired in parallel.
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Old 02-02-2012, 09:42 PM
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Quote:
Originally Posted by rwtdct View Post
And I have seen a lot of people buy batteries when it was the alternator.

The alternators that I replaced were definitely bad.

The first thing I check when I have a battery go dead is the alternator.

Anyways, I disconnected both batteries to see how many volts were in each, both 12 volts.

Next step...Load test each battery

I will let everyone know the outcome as soon as I do it. It might be a couple days. I live out in the country and sometimes work long days. So I will do it when I can.
Basically what everyone is telling you is your battieries could be bad and it can kill the alt too because it is over working itself.
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Old 02-04-2012, 07:21 PM
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Ok.....I went and had my batteries tested, both were fine. One the cranking amps were a little lower than the other. (old batteries were dated 05/06).

So I decided to replace them both anyways. (new ones dated 01/12)

Battery light is still on.

With the truck running (old and new batteries) the alt. is putting out 14.2 volts (seems a little high). The two wires coming out of the back of the alternator connector is at 12.2 volts running or turned off.

I am thinking replace the alternator.....anymore suggestions.
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