alternator voltage
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 222
Likes: 11
From: Strasburg,CO
alternator voltage
Ok. I have been having issues for awhile and I think I may have found the root cause, now here is the question. I put my truck on my scanner today and found that my voltage only puts out 12.6 at the most and when I have my heater and headlights on it drops to 11.7. (This is a stupid question and I know the obvious answer my voyage is low but) could this cause my 2003 6.0 to run like absolute crap and make things like my injectors to come up as a contribution code even after I replaced some? What else will this damage?
Both batteries were replaced in June.
Both batteries were replaced in June.
Thread Starter
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Mountain Pass
Joined: May 2011
Posts: 222
Likes: 11
From: Strasburg,CO
That's what I thought. F#$% Me!! I have been replacing injectors, icp, ipr, map sensor and so on and never thought to check my voltage. Would a oem Ford replacement from ford or other parts stores be fine to get my alternator or what would you suggest?
Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 242
From: Saratoga Springs,UT
I think you need a New Alternator
doesnt sound like it can keep up
the battery light should be on is it??
I replaced mine with a DC Power alternator and I havent heard of anyone having any issues with DC Power alts either
if you can swing it that what I would get
https://www.dcpowerinc.com/
Its built way better than OEM even a smaller pulley so it can crank the power out at Idel what sounds to be your issue not enough power at idel
With power problems you risk every electrical componet on the truck in therory
But usually low power takes out the all things Mark Mentioned
doesnt sound like it can keep up
the battery light should be on is it??
I replaced mine with a DC Power alternator and I havent heard of anyone having any issues with DC Power alts either
if you can swing it that what I would get
https://www.dcpowerinc.com/
Its built way better than OEM even a smaller pulley so it can crank the power out at Idel what sounds to be your issue not enough power at idel
With power problems you risk every electrical componet on the truck in therory
But usually low power takes out the all things Mark Mentioned
Fleet Owner
Joined: Nov 2003
Posts: 27,919
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Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 242
From: Saratoga Springs,UT
here ya go
https://www.dcpowerinc.com/
Click here^^^^^^^^
Great Product Glad I only had a 1 alternator setup
Its well worth it you may never have to worrey about a Alternator problem again
I dont know enough about it to say that you could get away just replacing the primary alt for now or Both is a Must
https://www.dcpowerinc.com/
Click here^^^^^^^^
Great Product Glad I only had a 1 alternator setup
Its well worth it you may never have to worrey about a Alternator problem again
I dont know enough about it to say that you could get away just replacing the primary alt for now or Both is a Must
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Senior User
Joined: Oct 2011
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i believe you can load test them on the back and see if thye are putting out 14v which is what they should be.
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
Thing is, both alts have to be bad if you're showing low batt voltage. It seems odd that two alts would fail, unless one failed a long time ago and the other failed recently. Either that or something is preventing those alts from getting power to either the A or I circuits.
Disconnect the small plugs from both of the alts and probe with a DVOM. You should have battery voltage to one wire on each plug, and voltage to the other wire with the key on, after the glow plug cycle completes. If you don't, your problem is somewhere else.
Disconnect the small plugs from both of the alts and probe with a DVOM. You should have battery voltage to one wire on each plug, and voltage to the other wire with the key on, after the glow plug cycle completes. If you don't, your problem is somewhere else.
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Cables, battery post cleaning, alternator post cleaning, check grounds. Suspect tow alts would die, but it could be one has bendead a while. Each alt should get you 14.4+ volts on charge, but you have to wait till glow plugs shut off. They alternate between each so check one, no volts, check the other, one should be puttin out.
