Bad alternator? - Page 2 - Ford Powerstroke Diesel Forum
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  #11  
Old 01-01-2013, 06:28 PM
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https://www.fleet.ford.com/truckbbas/non-html/Q91.pdf


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  #12  
Old 01-01-2013, 06:49 PM
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This is a video I found, not sure where the info is coming from about the alternator not charging on startup, but it's plain false.......https://www.youtube.com/watch?v=sTfu...e_gdata_player
These trucks pull a massive amount of power during startup and before the glowplugs shut off. The heated mirrors are also always on, I make sure my auto headlights are off, the ac is off, and the heated seats are not activated.

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  #13  
Old 01-01-2013, 06:54 PM
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hmmm you guys are going to make me attempt to check amp draw on a bank of glowplugs. I'm curious now
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Old 01-01-2013, 06:57 PM
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Quote:
Originally Posted by sinner6.0L View Post
hmmm you guys are going to make me attempt to check amp draw on a bank of glowplugs. I'm curious now
That would be great info, I don't have an amp meter, just a very expensive fluke. Lol.

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  #15  
Old 01-01-2013, 06:58 PM
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sorry southend. I just dont believe that video something is going on there. I believe that engine in the video is warm which would also help starting.. anyways, i have asked lots of questions about this to people that work on these and they all say that the low voltage is typical upon cold startup. Like i said, its in the pcm i stated before in my other thread. Its by design from seeing how the wiring is on the pcm. I just dont want to see people freak out over nothing if thats the case... My truck has done this since day 1...
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  #16  
Old 01-01-2013, 07:00 PM
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Here is a video I made a couple months ago, my volts start to climb after start up, then I hit the high idle switch and volts really start to climb, then GP shut off and hit 14's. I have the dual alt set-up.

http://youtu.be/BEULfjYBXPo




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  #17  
Old 01-01-2013, 07:01 PM
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my amp draws on all 8 brande new glow plugs and plug harnesses were at 191-193 amps
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  #18  
Old 01-01-2013, 07:04 PM
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Oh so it's one or the other. Huh, a little odd, but,,,huh. I've only measured alternator outputs and glow plug draw once. That one time must have been the time the ECM chose the primary alternator. May have to measure alternator outputs a few times if I get bored at work one day.

Hey sinner6.0. Mine measured around 180A per bank at initial time zero, and quickly dropped down to around 65A per bank as the plugs heated.
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  #19  
Old 01-01-2013, 07:06 PM
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Mine will show about 11.6v for the first few minutes then jump to 13.6. It's normal.
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  #20  
Old 01-01-2013, 07:23 PM
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In the video I posted, it says the temp was 30, it sounds like a cold engine, a 7.3 at that, lol. In both videos that were posted, you can see the voltage rise after starting, there is no way a battery can recharge itself, the alternators are charging as best as they can on start up. I see it no other way.

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