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Old 01-01-2013, 08:59 AM
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Bad alternator?

2006 f250 6.0. Just installed the sct livewire so I can see that the battery voltage stays around 11.8 when the truck first starts up. After about three minutes it bumps up to 13.6~. I have never seen something like this.
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Old 01-01-2013, 09:11 AM
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The drop down in voltage is from the glow plugs being on, they can be commanded on for up to 120 seconds depending on ambient temp.


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Old 01-01-2013, 09:12 AM
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I've heard two different stories. One that the ECM doesn't turn on the alternator until the glow plugs are turned off, and another that the 200+/-Amps that the glow plugs draw are keeping the voltage down, and once they cycle off the voltage jumps up.
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Old 01-01-2013, 09:13 AM
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On my dual alternator setup, the single one doesn't put out at first, but the second one does., So,,, it's one or the other.
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Old 01-01-2013, 09:15 AM
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I see something similar on my truck....usually upon start I'm at the upper 11's or low 12's then after a couple minutes, it goes to 13+. I believe there are 2 things going on here. First, the glow plugs still are on which have a good draw and secondly I believe the programming of the truck doesn't kick on the alternator for charging purposes until a few minutes afterwards. I could have sworn that I read up on this exact thing and after getting the response, I haven't worried about it since.
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Old 01-01-2013, 10:33 AM
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Seems like the FICM would need as much as possible so it would be up pretty quick. Since having the gauges in front of me, it's a little different. Thanks guys. Any links to a write up on what and how to install a second alternator?
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Old 01-01-2013, 10:38 AM
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you won't be adding duals to a truck that came equipped with a single without a PCM from a dual truck and brackets /belts/ pulleys /wiring / secondary alternator ETC

ford has a procedure on how to eliminate 1 of the duals but states adding a dual isn't advised and has no procedure on how to do so
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Old 01-01-2013, 10:41 AM
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FYI the longer you wait after the WTS light goes out the longer you are into the 2 minute cycle so the faster your truck will jump up to full charge

even does it when it's 120 degrees outside LOL
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Old 01-01-2013, 11:33 AM
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Excellent info guys thanks. I was thinking for the camper a dual alternator would be nice, but sounds like that's not an easy option. I might look into a single high output alternator. Thanks guys.
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Old 01-01-2013, 06:27 PM
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Quote:
Originally Posted by ZMANN View Post
you won't be adding duals to a truck that came equipped with a single without a PCM from a dual truck and brackets /belts/ pulleys /wiring / secondary alternator ETC

ford has a procedure on how to eliminate 1 of the duals but states adding a dual isn't advised and has no procedure on how to do so
I was thinking there was a dealer kit that they could add the second alternator. The second one isn't controlled by the ECM. It's just a regular ole alternator like my '77 F150 had. 'Cept better and bigger.
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