New Batteries and Alternator...still not charging. - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 08-06-2006, 04:47 PM   #1 (permalink)
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New Batteries and Alternator...still not charging.

Recently replaced both batteries. They gradually went dead after a couple of days of use. Then I replaced the alternator, but it is still not charging. To top it off my code reader is not working for some mysterious reason. Help! [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 08-06-2006, 06:13 PM   #2 (permalink)
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Re: New Batteries and Alternator...still not charging.

Did you recharge the dead batteries with a dedicated battery charger or attempt to charge them with the new alternator? The latter procedure is not recommended and frequently will burn out the voltage regulator in the alternator. There is a fuse link in the wire to the battery (goes to the passenger side battery). If this fuse link blew, the alternator may be putting out the juice but it is not getting to the batteries. Use a continuity tester to make sure this connection is intact. If the connection is intact, charge the batteries, and take to your local autoparts store to test in the truck or remove the alternator and have it tested where you purchased it. It must be in warranty.
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Old 08-07-2006, 01:24 PM   #3 (permalink)
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Re: New Batteries and Alternator...still not charging.

The reason I thought that the new alternator was not charging is because the batteries didn't charge after running a while with the new alternator. Now I've charged the batteries with a battery charger and did some checking with the multimeter.

Battery Voltage without engine running: 13V
Battery Voltage with engine running: 13.7 - 14 V
Current from alternator to battery: 2.9 - 3.5 amps

Seems like the charging voltage is still low?
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Old 08-07-2006, 02:12 PM   #4 (permalink)
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Re: New Batteries and Alternator...still not charging.

Those numbers sound reasonable to me.
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Old 08-07-2006, 02:25 PM   #5 (permalink)
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Re: New Batteries and Alternator...still not charging.

Does it seem reasonable that the new alternator did not charge the batteries, but after charging them with a battery charger the alternator is now working?
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Old 08-07-2006, 02:39 PM   #6 (permalink)
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Re: New Batteries and Alternator...still not charging.

It may not have been able to put out enough current to charge the batteries. How many amps is the alternator rated for. My alternator (WranglerNW) is rated for 200 amps. So I know that it will keep up with the demands I place on it. You might simulate a load test by turning on a bunch of circuits ie. lights, wipers, stereo etc and se if the voltage drops and what the current is from the alternator?
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Old 08-07-2006, 04:13 PM   #7 (permalink)
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Re: New Batteries and Alternator...still not charging.

Don't know about amps. I'll check.
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Old 08-07-2006, 10:48 PM   #8 (permalink)
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Re: New Batteries and Alternator...still not charging.

good way to check amp output is put amp meter on hot wire of alt and put a load tester on batts and load them and monitor the amps
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Old 08-08-2006, 10:24 AM   #9 (permalink)
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Re: New Batteries and Alternator...still not charging.

The alternator requires voltage from the batteries to create a field in the alternator. If the batteries were dead the alternator will not charge. even if the engine is running.
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Old 08-08-2006, 03:21 PM   #10 (permalink)
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Re: New Batteries and Alternator...still not charging.

An alternator will not completely charge dead batteries. You need to charge your batteries w/ a actual battery charger if they were dead. It's best to trickle charge them overnight if they were really low.
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Old 08-08-2006, 05:00 PM   #11 (permalink)
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Re: New Batteries and Alternator...still not charging.

[ QUOTE ]
The alternator requires voltage from the batteries to create a field in the alternator. If the batteries were dead the alternator will not charge. even if the engine is running.

[/ QUOTE ]

The engine won't run if the batteries are dead and the alternator is not charging.
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Old 08-09-2006, 02:30 PM   #12 (permalink)
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Re: New Batteries and Alternator...still not charging.

[ QUOTE ]
An alternator will not completely charge dead batteries. You need to charge your batteries w/ a actual battery charger if they were dead. It's best to trickle charge them overnight if they were really low.

[/ QUOTE ]

I think this is what happened. I haven't had any problems since, and I have driven at least 1000 miles with my headlights on.
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Old 08-09-2006, 04:26 PM   #13 (permalink)
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Re: New Batteries and Alternator...still not charging.

Read all the posts. Thanks for all the info. Still living on org. batteries 2000 F-250 SD. Spins OK.
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Old 03-01-2013, 04:30 PM   #14 (permalink)
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Make sure your Ground wire is connected to the frame

Your gound wire that runs from the smaller nut on the case of your alternator needs to be grounded to battery of frame or your unit will not work.
Tap case if brushes are carboned up this will allow the spring in the brush holder to push on brushes to slip ring. the 1991 are very good and easy to rebuild ;the stator wires ocassionally suffer from the sodder breaking off.
I have rebuild starters and alternators for years.
You can trigger your alternator by using a short wire clip to one of the brush holders to the battery larger terminal on the alternator. These apply to the 70 and 90 amp larger case ford alternator. You can hear a sound as you trigger the field.
Alternators need a certain RPM from engine to excite ;unless it is a marine excites with special 900 RPM's Normally alternators need RPM of about 1200 to excite the unit.
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Old 03-01-2013, 04:38 PM   #15 (permalink)
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You replied to a 6 year old thread.
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