Primary altenator fried - Ford Powerstroke Diesel Forum
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Old 03-10-2012, 07:23 AM
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Primary altenator fried

Hey I'm new to the forum and my new to me 08 f250 has an altenator problem. It has dual alternators and the bottom (primary one) fried while idling in the driveway. Just wondering if it's ok to run with the secondary until I can get a new one? No one has them in stock. I'm not running any accessories and I have the wire disconnected from the primary so it won't kill my batteries.
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Old 03-10-2012, 07:59 AM
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What is the truck used for?
If you don't have a need for duals, just leave the bottom one completely off the system.
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Old 03-10-2012, 08:13 AM
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I just drive it on weekends I don tow anything


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Old 03-10-2012, 09:02 AM
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Towing has no relation to duals.
Vehicles with many lights, large stereo systems, or ones that idle very often have dual setups. This is because of either the very, very large draw from the various systems, or the fact that, while idling, the alternator is not putting out a lot of power.
So do you just drive it normally, or do you do something very electrically demanding?
Now, unless I'm wrong, the dual alternator package was an option, correct?
And, when you're talking about dual alternators, or batteries for that matter, as long as they are in parallel, there is no primary. Unless I'm wrong again.
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Old 03-10-2012, 09:17 AM
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There is a sub in the truck but I barely have it going when I drive it. I don't let it idle very long and my drives aren't that long either. The dual altenators were an option I believe and from what I can tell the pervious owner might of had a fuel tank in the bed to fuel machines idk. From the information I could find online the PCM controls which altenator to use once the primary cant keep up it uses the auxiliary too which is rated at less amps.


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Old 03-10-2012, 09:28 AM
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Gotcha.
I knew starting with 6.0s, the PCM commanded the alternator on or off.
I'd think you'd be fine for now without the primary running.
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Old 03-10-2012, 09:39 AM
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Yea I hope so I have one ordered so it's only gonna be for a little while I believe the PCM would have to be reflashed to swap it back to a single setup.
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