7.3l brand new Alternator tests good but won't charge in truck. - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 23 (permalink) Old 03-29-2017, 04:31 PM Thread Starter
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7.3l brand new Alternator tests good but won't charge in truck.

New guy here having an alternator issue. I purchased an OEM replacement alternator for my 03 7.3l 250.

Alternator doesn't work, I took it to an alternator shop and the guy tested and it ran fine.

He told me that I could have an issue with the fusible link in my battery wire or in the regulator wires.

He also said one wire goes from the ignition switch to the regulator and the other side goes to one side of the battery light indicator.

He also explained that the wires tend to rub threw at the valve cover wire harness connector.

I believe all this to be true hopefully you all can shed some light for me.

I really need a wire schematic that shows where the wires are goin because it sounds like I will need to do some rewiring. I am capable of doing this. This is just my first 250 just need to be pointed in the right direction.

Any guidance out there?
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post #2 of 23 (permalink) Old 03-29-2017, 06:27 PM
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

check your fuses, there will be one that says alternator or generator


Is the battery light on in the dash?

The ford alternator has a built in voltage regulator that must get power from the dash or your good alternator will not charge
The fuse is on the power side of the voltage regulator

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post #3 of 23 (permalink) Old 03-29-2017, 06:30 PM
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

There's also fusible links on the charge wire.

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post #4 of 23 (permalink) Old 03-29-2017, 07:43 PM Thread Starter
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

Yes the battery light is on and I will check fuses when I get home.
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post #5 of 23 (permalink) Old 03-29-2017, 07:44 PM Thread Starter
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

I know about the fusible link it is good.
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post #6 of 23 (permalink) Old 03-29-2017, 07:50 PM
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

You should have power to one of the small wires on the alt. Without power there. It won't charge. Can't remember the color.

I actually run an alt from a ford ranger. It's a 160a vs the stock 120a. It's also a single wire alt. One wire runs to the light on the dash.

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post #7 of 23 (permalink) Old 03-29-2017, 08:22 PM Thread Starter
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

What year ranger alternator?
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post #8 of 23 (permalink) Old 03-29-2017, 08:32 PM
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

94 and up I believe. They come on many different engines. I grabbed one from a van. I believe the ones from an obs are the same. What your looking for is a large case 3G alt. You will have to change your pigtail. I got my alt from a junk yard along with the pigtail.

01 f-250, Standard
Rev tech 4" lift, 37" military wrangler Mt tires
KC diy 66, Full force 160/100 and custom tunes from PHP
Banks intercooler and full 4" exhaust, Diy S&B intake
Diy quad feed, Hydra, Isspro boost, pyro, and fuel pressure
3/0 battery cables with military style terminals
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post #9 of 23 (permalink) Old 03-29-2017, 08:35 PM
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

Just an FYI. You will need to grind some material off of the accessory bracket under the alt to make them fit.

01 f-250, Standard
Rev tech 4" lift, 37" military wrangler Mt tires
KC diy 66, Full force 160/100 and custom tunes from PHP
Banks intercooler and full 4" exhaust, Diy S&B intake
Diy quad feed, Hydra, Isspro boost, pyro, and fuel pressure
3/0 battery cables with military style terminals
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post #10 of 23 (permalink) Old 03-29-2017, 09:55 PM
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Re: 7.3l brand new Alternator tests good but won't charge in truck.

closely inspect the plug that goes into the alternator. they tend to burn contacts, or the contacts disfigure and loose contact when they get hot.

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