Sounds like the FICM is already f**ked up.
The 11.8 isnt unheard of while the GPs are active.
The 11.8 isnt unheard of while the GPs are active.
turn on delay & problems that it can cause
i have a question involving my 07. i have factory twin alternators also . when i start up theres about a 30-45 second delay before the alternators tun on ( or the primary to the best of my knowlage) during this " delay " the truck idles and voltage rests at around 11.8. also during this time my FICM voltage is low low .. ive seen it as low as 41.5v eekkkk . ive read that this is caused by the glow plugs staying active causing the voltage to drop , however i can actually hear the motor bog down ( indicating the alts kicking on putting a load on the motor) and then voltage slowly rises . takes about 2 minutes for the FICM to reach 48.5 . i just cant believe the voltage is due to glow plugs. it never did this not once last winter . so heres my questions . .
is my primary alt shot , and the truck just takes a minute or so to realize theres no output from the primary , thus turning on the secondary?
and am i going to f**k up my FICM seeing that low of voltage every time i start the truck?
is my primary alt shot , and the truck just takes a minute or so to realize theres no output from the primary , thus turning on the secondary?
and am i going to f**k up my FICM seeing that low of voltage every time i start the truck?
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I've seen high 10s after my truck sits or a few days and almost always high 11s after sitting for a few hours.
FICM sounds dead already.
If you want to increase the voltage at idle do the big 3 wire upgrade and an alternator with a high amperage output at idle. GPs draw up to 250 amps (IIRC) along with all the other stuff radio, AC, lights etc.
FICM sounds dead already.
If you want to increase the voltage at idle do the big 3 wire upgrade and an alternator with a high amperage output at idle. GPs draw up to 250 amps (IIRC) along with all the other stuff radio, AC, lights etc.
1 - 3 of 3 Posts
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