Replaced Alternator and Batteries. Battery light on. - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 07-21-2016, 03:46 AM Thread Starter
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Replaced Alternator and Batteries. Battery light on.

Just the other day my wife called and said there was white smoke coming from under the hood of the truck and she could smell something burning. I got the truck home and tried to start it and the batteries were dead. The smoke was coming from the passenger side which is were the alternator is. So I bought a 200 amp reman alternator from Advanced Auto (Carquest) and installed it. I could see that the original alternator was definitely burnt. I had put both batteries on charge before I started the replacement. Put them back in and tried to start the truck but they were still dead. Took them to Auto Zone and they both tested bad. I purchased two new batteries and the truck starts fine and no smoke or burning smell. But now the battery light is illuminated. With the engine off I tested both batteries with my multimeter and both are over 12V. Started the truck and the voltage goes to 13.5V. Revved engine to 2500RPM voltage holds at 13.5V. Turned everything on to put a load on it (lights, wipers, hazards, seat heaters, ac, etc) and voltage goes to 14.4V. So it appears that the alternator is doing its job. I've read on some other forum that not all alternators are recognizable by the computer? Anyone know if this is true? What else should I look for? Thanks guys.

2008 F250 119k miles

Last edited by j0ker; 07-21-2016 at 03:54 AM.
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post #2 of 12 Old 07-21-2016, 05:17 AM
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probably a damaged wire somewhere from the heat.

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So says the internet... ...and so it shall be.
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OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #3 of 12 Old 07-21-2016, 10:09 AM Thread Starter
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probably a damaged wire somewhere from the heat.
Would the wire most likely be part of the harness? Would it be easier to just replace it?

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post #4 of 12 Old 07-21-2016, 04:45 PM
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Stupid Question

This may be a stupid question, but do you have two Alternators? I had to replace one alternator, bearing was going and while I was in there replaced the second one. I had the Batt light come on at idel and it turned out one of the alternators was bad.
Just a thought.
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post #5 of 12 Old 07-22-2016, 04:01 AM Thread Starter
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Only one alternator.
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post #6 of 12 Old 07-22-2016, 04:48 AM
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try clearing the codes. the batt light will sometimes stay on if you don't. disconnecting batteries will not clear the code
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post #7 of 12 Old 07-22-2016, 10:23 AM Thread Starter
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Thanks Kaya. I'll try that tonight when I get home and report back.

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post #8 of 12 Old 08-03-2016, 07:57 PM
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Every week or so I top off my batteries using a good float charger. I like Battery Minder brand, puts out 8 amps but will de-sulfate the batteries and charge them to 100%. In the winter I do this every week. I have a connect wired to the truck and can connect it with the hood closed. Running the charger all weekend.

When I first purchased the truck used the charger worked for hours to get the batteries into shape. Now in a few hours it gets into the float charge mode.

The 2006 vintage truck would eat alternators due to weak batteries. Not as big of a problem with the 2008-10 vintage, but all diesel love to have strong batteries.
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post #9 of 12 Old 08-04-2016, 01:03 AM Thread Starter
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cleared the codes but it came right back. Havent' had the time to look for a wiring issue as of yet.
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post #10 of 12 Old 08-04-2016, 06:13 AM
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hmmm. i've heard of issues with aftermarket alternators on these trucks...

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