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  #1  
Old 12-01-2010, 01:10 PM
mblanken881 mblanken881 is offline
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What should battery voltage be?

I am getting the following using ScangaugeII:

Voltage w/ keyoff: 12.5
Voltage w/ key on after glow plug light turns off: 10.9-11.1
Voltage after about 30 sec of running: 13.9-14.0

I'm a little worried about 10.9-11.1. Seems low. Think my batteries are shot?
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  #2  
Old 12-01-2010, 01:21 PM
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My post glow plug is a little higher but still in the ball park.
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  #3  
Old 12-01-2010, 02:47 PM
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Sounds perfectly normal to me... The alternator does not kick in the instant you start the truck either. I know this from checking alternator amp draw repeatedly the other night.
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Old 12-01-2010, 04:39 PM
mblanken881 mblanken881 is offline
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Alright thanks. Good news
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  #5  
Old 12-01-2010, 06:46 PM
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bill.pounds.1
Quote:
Originally Posted by mblanken881 View Post
Voltage w/ keyoff: 12.5
Sounds good.

Quote:
Originally Posted by mblanken881 View Post
Voltage w/ key on after glow plug light turns off: 10.9-11.1
Sounds a bit low. I've never seen mine drop into the 10's. Your reserve amps might be on the low side. How old are these batts? Not the originals, I hope. Right here is where your FICM is most vulnerable, with glow plugs on, voltage low, and you hit the starter. I would get those batts load tested.

Quote:
Originally Posted by mblanken881 View Post
Voltage after about 30 sec of running: 13.9-14.0
Your alternator is working good.
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  #6  
Old 12-01-2010, 07:20 PM
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Check fluid level in the battery (s). 12.5 is starting to get low too....Mine (fairly new) is running 12.7 -no load. Agreed - the alternator is doing it's job.

Maybe get it (them) load-tested.
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  #7  
Old 12-01-2010, 07:27 PM
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That sounds good to me, I believe just because the glowplug light is off, it doesn't mean the glowplugs are off, so you still have a 180 amp draw till they turn off.
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Old 12-01-2010, 11:52 PM
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Check out post 10 on the following link

http://www.ford-trucks.com/forums/88...-bad-ficm.html
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Old 12-02-2010, 01:04 PM
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Quote:
Originally Posted by jasontrucks76 View Post
Sounds perfectly normal to me... The alternator does not kick in the instant you start the truck either. I know this from checking alternator amp draw repeatedly the other night.
So are you saying the alternator is OFF the first 20 to 30 seconds the motor is running?

You disconnected the alternator output and ran it through a ampmeter to verify no alternator output?

If true, I'll have to get my electrical diagram out and see how Ford cuts off the alternator. I assume they interrupt the exciter field voltage.

DSMMH
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Old 12-02-2010, 01:09 PM
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Quote:
Originally Posted by DSMMH View Post
So are you saying the alternator is OFF the first 20 to 30 seconds the motor is running?
It is true. You can clearly see it on a gauge. I don't know how it is done.
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  #11  
Old 12-02-2010, 01:14 PM
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This is a question I had for a long time and I finally tested it with a clamp ammeter.

The voltage regulator in the alternator is turned on by the I circuit. In a single alternator setup, that circuit goes to the instrument cluster and is part of what controls the battery warning light.

The instrument cluster does not apply voltage to the I circuit, thus not turning on the alternator, until the glow plugs have shut off.

The test I did was to put the clamp ammeter on the B+ wire coming out of the alternator. I then started the truck cold and observed little voltage (less than 5 volts) for about 90 seconds. Then I observed it go up to about 90 amps.
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Old 12-02-2010, 01:18 PM
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Here is the single alternator wiring diagram.
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  #13  
Old 12-02-2010, 01:38 PM
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Quote:
Originally Posted by dchamberlain View Post
This is a question I had for a long time and I finally tested it with a clamp ammeter.

The voltage regulator in the alternator is turned on by the I circuit. In a single alternator setup, that circuit goes to the instrument cluster and is part of what controls the battery warning light.

The instrument cluster does not apply voltage to the I circuit, thus not turning on the alternator, until the glow plugs have shut off.

The test I did was to put the clamp ammeter on the B+ wire coming out of the alternator. I then started the truck cold and observed little voltage (less than 5 volts) for about 90 seconds. Then I observed it go up to about 90 amps.
Thanks for the info. I'll have to do a little research to totally understand this. i hate partial mysteries.

DSMMH
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  #14  
Old 12-02-2010, 04:20 PM
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Thanks for jumping in there guys!

I had to work today :0(

I noticed this when I replaced my alternator a couple days ago and had to dig in to it a little to figure out why also. Not sure I still know WHY Ford does it this was but i now know what i am seeing is correct.

Gould it be that the GP's draw more then the single alternator can handle so they just decided to keep the alternator off until they cycle off?
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  #15  
Old 12-02-2010, 04:24 PM
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I've wondered why they do it too. The only thing I can figure is that the very high current draw of the glow plugs might cause damage to the alternator over time.
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Old 12-02-2010, 04:24 PM
 
 
 
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