Maybe Alternator
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Maybe Alternator
I am noticing that my batteries aren't getting up to where they should be after I start the truck and the glow plugs go offline. I'm suspecting the alternator here. What would be the sensors that I should have on my autoenginuity to be reading while I do a little trip to see if it truly is the alternator? I'm fairly sure it's not the batteries as they are only 2 months old, unless I was just unlucky enough to get a bad batch.
I haven't pulled codes yet, so maybe it does thru a certain code as well, but I was hoping there there were specific sensors that would let me know if I am having alternator problems.
Thanks.
I haven't pulled codes yet, so maybe it does thru a certain code as well, but I was hoping there there were specific sensors that would let me know if I am having alternator problems.
Thanks.
Postmaster
Joined: Sep 2006
Posts: 3,048
Likes: 1
just monitor the voltage on the system, not sure if you can monitor ALT output. if not if you have DMM, just rig somthing up to monitor the alternator output in the cab while driving.
whats the voltage on the bats with the truck running and the truck off.
whats the voltage on the bats with the truck running and the truck off.
Thread Starter
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Well I have to guess on the volts due to the range of display on my analog gauge, but before cranking it's like 10.1 to maybe 11, somewhere in there. After the glow plugs kick off it's 13 to maybe 13.8 depending on what electronics and at what volume(if applicable) I may have it on.
It's the ~10.1 before I crank it that has me worried more then anything.
I'll check to see if I can monitor Alt. Output(if it's on the OBD-II I should be able to) and if I can what do I need to be looking for?
It's the ~10.1 before I crank it that has me worried more then anything.
I'll check to see if I can monitor Alt. Output(if it's on the OBD-II I should be able to) and if I can what do I need to be looking for?
Thread Starter
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
What does an alternator usually run(factory to aftermarket)? I've really never kept a vehicle to the point it needed one before.
Postmaster
Joined: Sep 2006
Posts: 3,048
Likes: 1
you gauges your radioand radar detector wont draw enough to load the alt that much...and dont know the prices on alt.
might be just a diode pack-regulator.. can you take it out and have it tested?or have them tested when you go to any automotive place, some have free eval on electrical systems...
talk to Larry - toolman05KR, he rebuilds them
might be just a diode pack-regulator.. can you take it out and have it tested?or have them tested when you go to any automotive place, some have free eval on electrical systems...
talk to Larry - toolman05KR, he rebuilds them
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Senior User
Joined: Oct 2005
Posts: 465
Likes: 1
From: Nesconset NY
Yea pete, one of our 200A 6G alternators will fix it right up.
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Thread Starter
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
Oh yea, he and I are already starting to get know one another due to my ESOF issues as well.
Postmaster
Joined: Sep 2006
Posts: 3,048
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ESOF , had it on my 2001 had the same problem , working not working, ended up replacing all dustseals, and o-rings in the hubs, and found a vacum leak too.
and all i can say Larry is a great guy....
all off - 12-12.5v
cranking - 10.5-11v
running - 14-14.4v
at list thats what i remembered.
you dont want it to go to close to 10 or below , it will Kill you FICM...
and all i can say Larry is a great guy....
all off - 12-12.5v
cranking - 10.5-11v
running - 14-14.4v
at list thats what i remembered.
you dont want it to go to close to 10 or below , it will Kill you FICM...
Thread Starter
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
I'm low on all those I know. Damn this is all I need. First ESOF, then I had to get a new phone(see previous thread) and now this crap. Unbelievable.
Senior User
Joined: Oct 2005
Posts: 465
Likes: 1
From: Nesconset NY
When you start, the volts can be as low as 11.5 at the battery, (guages usually read about 3/4 volt lower because your tapping off a key on-off line) once you start the amps can be 100 or more, depending on temp. and the volts will be low, about 12.4 to 12.7 and after 90 to 120 seconds it should jump the voltage to 14.1 or better and the amps should drop at the same time. 30 amps or lower at this stage is normal. Let me know how you make out.