Post your alternator output on your 6.0! - Diesel Forum - TheDieselStop.com
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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties 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 6.0L Power Stroke engine.

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Old 03-22-2010, 10:24 PM   #1 (permalink)
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Post your alternator output on your 6.0!

I just got home from Cali today, after 33 days away. Apparently I left my GPS on so I arrived back to a dead truck. After jumping it, I utilized the voltmeter function on my Tekonsha P3 to find my output voltage was roughly 11.5 volts, obviously not good! So I hauled @$$ home (110 miles) to go to the dealer and pick up a new alternator. As I was traveling (80+ MPH) I was getting roughly 12.6v out of the truck, and toward the end of the trip I was getting roughly 13.2v. Picked up a new alternator at the dealer, installed it, and on my trip to the girl's house I was getting between 13.6-13.8v underway with the lights on, and at idle it dropped down to 13.4v. Batteries are less than a year old (Diehard Platinums) and the connections all seamed corrosion free. Any ideas? It's a single alternator setup by the way.
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Old 03-22-2010, 11:42 PM   #2 (permalink)
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Your voltage with the new alternator is about on par with mine.. I am going to upgrade to a 160amp large case (the factory is a 110amp small case) though in the next couple of weeks because with the camper on behind me at night, it drops to 13.1 or 13.2..
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Old 03-23-2010, 11:50 AM   #3 (permalink)
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I son't see anything alarming about your voltages. The alternator output will be low with low batteries. The voltage will go up as the batteries take a charge and need less and less current. I'm not sure your old alternator was bad. It takes a fair amount of current and time to bring the batteries back up.

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Old 03-23-2010, 08:09 PM   #4 (permalink)
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my volts when starting after a couple of minutes are 14.8 but go lower after alt heats up with lights on 30minutes later 13.8 to 13.5
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Old 03-23-2010, 09:02 PM   #5 (permalink)
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Quote:
Originally Posted by turbodieselny View Post
my volts when starting after a couple of minutes are 14.8 but go lower after alt heats up with lights on 30minutes later 13.8 to 13.5
Yes, but you didn't start with a dead battery and need a jump start.

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05 F350 front axle and aluminum wheels 275/70-18 tires.
46 Gal tank - harpooned pump vent tube.
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Old 03-23-2010, 09:36 PM   #6 (permalink)
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dead batteries ? sho 91 mtx asked to post our volts read the title by the way my batts are original motorcraft build date 2002 november
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Old 03-23-2010, 09:58 PM   #7 (permalink)
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My alternator is a month old. 13.9v-14.1v is my typical voltage
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Old 03-25-2010, 03:51 PM   #8 (permalink)
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For the last month my morning start ups were taking a little longer than usual and just didn't sound right. Took an alternator reading last week and it was 13.8v. Battery reading was 11.4v (with engine off). My Motorcraft batteries were purchased Jan '08. Took my truck to Ford Dealer this last Saturday with the receipt in hand. An hour later service advisor says truck is ready the batteries were defective and they gave me two new batteries under warranty.

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Old 03-25-2010, 06:14 PM   #9 (permalink)
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Mines at 12.6 before start up, then hangs at about 11.7 until the glow plugs click off. After that my voltage jumps back to 12.5, then slowly ramps up to 14.1 for about 5 minutes, then drops and stays around 13.1 to 13.4 the rest of the time.
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Old 03-25-2010, 07:21 PM   #10 (permalink)
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Hear is some real good reading about alternator's.
I was have issues with mine and got a 200 amp HD large case and my truck LOVE'S it.

http://thediesel garage.com/forums/showthread.php?t=92173

Last edited by work&play; 03-25-2010 at 07:25 PM.
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