Well time for new batteries
#16
11-09-2012, 06:38 PM
The alternator is actually on as soon as the engine starts, which is why in your case the voltage got up to 12 as soon as the engine started - the batteries sure weren't going to jump up just because the engine was running when the glow plugs were still on. It is clear that new batteries are needed, with that low initial voltage reading, so you are doing the right thing there. Cycling the glow plugs several times is not only a bad thing to do for your batteries, it doesn't do anything to help a start - remember that the glow plugs stay on for several minutes anyway, after the light goes out, and as soon as the glow plug is hot enough to fire the cylinder, it doesn't need more time. Keeping the glow plugs lit for a long time is not a starting aid, it's to reduce emissions while the engine is being over-fueled while it's still cold. My advice is don't do that any more, your batteries, FICM and injectors will all thank you with longer and better service.
Brian
Brian
The alternator will not turn on till the Glow Plugs Turn Off so upto 2 minutes depending on a few things like Ambeint temp,EOT, maybe ECT
this is to avoid a 80-100 amp Voltage spike when GP Shuts Off
You can see this with a Digital Voltage gauge
I had a bad battery a few weeks back bad cell it was a Night and day diffrence in how it ran that first minute or too with good batterys tons better i was surpriseed
#17
11-09-2012, 06:52 PM
The alternator will not turn on till the Glow Plugs Turn Off so upto 2 minutes depending on a few things like Ambeint temp,EOT, maybe ECT
this is to avoid a 80-100 amp Voltage spike when GP Shuts Off
You can see this with a Digital Voltage gauge
I had a bad battery a few weeks back bad cell it was a Night and day diffrence in how it ran that first minute or too with good batterys tons better i was surpriseed
this is to avoid a 80-100 amp Voltage spike when GP Shuts Off
You can see this with a Digital Voltage gauge
I had a bad battery a few weeks back bad cell it was a Night and day diffrence in how it ran that first minute or too with good batterys tons better i was surpriseed
Seems odd, or at least bass-ackwards to me at times.
I'll add to the earlier comments, I am also a big fan of Walmart batteries.
Josh
#19
11-09-2012, 07:05 PM
Quite honestly, IMO, it's silly to not test a component as close to that component as you can get. I'd test at the alternator and at the battery.
#20
11-09-2012, 07:08 PM
Blade35, I don't understand the no charge while GP are on. My digital meter shows volts rising while GP at on. If it matters, I have the dual alt system.
6.0 GP vs Alt - YouTube
6.0 GP vs Alt - YouTube
https://www.fleet.ford.com/truckbbas/non-html/Q91.pdf
Notice the background section of that PDF:
"The 6.0L Diesel engine Powertrain Control Module (PCM) will randomly select only one of the alternators to be
active when the glow plugs are active. There is no way to tell the PCM that one of the alternators has been
removed, so the removed alternator may be selected by the PCM. The lack of a working alternator during glow plug
activation would result in discharged batteries. "
Josh
#21
11-09-2012, 07:16 PM
Josh
#23
11-09-2012, 07:27 PM
It's never been my experience with 12,000 pound electric winches, on-board welders or high powered stereos that there is any amp spike that the alternator and batteries do not either catch in time or cushion.
I will admit the FICM seems more vulnerable to voltage than most auto electrical systems.
You somewhat see the spike in your Youtube video (about 1:04) as the voltage climbs to 15 volts as the GP cycle off, but then fall to normal levels.
Josh
#24
11-09-2012, 07:39 PM
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Well I'll check the testing of battery off, then test vehicle running no load check battery and alternator then use my AE to rev the RPM up to around 1100. Then I'll check voltage and see what I get.
This evening when I had my lights on using my Edge I was getting around 13.2 battery while my FICM stayed around 47.0 to 48.0. Luckily I get payed next week from my second job so I'll defently be able to get a new alternator if testing comes out bad. Of course I have the single alternator system for my truck.
Hopefully with new alternator and batteries I will have around the 14v that I use to have after I got the truck.
This evening when I had my lights on using my Edge I was getting around 13.2 battery while my FICM stayed around 47.0 to 48.0. Luckily I get payed next week from my second job so I'll defently be able to get a new alternator if testing comes out bad. Of course I have the single alternator system for my truck.
Hopefully with new alternator and batteries I will have around the 14v that I use to have after I got the truck.
#25
11-09-2012, 08:42 PM
In theory a dual alternator set-up should be charging at all times regardless of what the glow plugs are doing.
https://www.fleet.ford.com/truckbbas/non-html/Q91.pdf
Notice the background section of that PDF:
"The 6.0L Diesel engine Powertrain Control Module (PCM) will randomly select only one of the alternators to be
active when the glow plugs are active. There is no way to tell the PCM that one of the alternators has been
removed, so the removed alternator may be selected by the PCM. The lack of a working alternator during glow plug
activation would result in discharged batteries. "
Josh
https://www.fleet.ford.com/truckbbas/non-html/Q91.pdf
Notice the background section of that PDF:
"The 6.0L Diesel engine Powertrain Control Module (PCM) will randomly select only one of the alternators to be
active when the glow plugs are active. There is no way to tell the PCM that one of the alternators has been
removed, so the removed alternator may be selected by the PCM. The lack of a working alternator during glow plug
activation would result in discharged batteries. "
Josh
Chuck
#26
11-09-2012, 08:54 PM
Posting Guru
#27
11-09-2012, 09:40 PM
#29
11-09-2012, 10:18 PM
A couple of these ought to do the trick:
BRAILLE BATTERY ML30C MICRO LITE LITHIUM 12V 1106CCA on eBay!
BRAILLE BATTERY ML30C MICRO LITE LITHIUM 12V 1106CCA on eBay!
#30
11-09-2012, 10:27 PM
A couple of these ought to do the trick:
BRAILLE BATTERY ML30C MICRO LITE LITHIUM 12V 1106CCA on eBay!
BRAILLE BATTERY ML30C MICRO LITE LITHIUM 12V 1106CCA on eBay!
Sweet just need a Second Morgage on the House to get those ones LOL