Weird voltage issues
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Post Fiend
Joined: Sep 2005
Posts: 5,955
Likes: 9
From: Ohio
Weird voltage issues
So i just got my batteries (both) replaced with duralast golds and my alternator replaced about 3 weeks ago. Last week, when ever i start my truck (when its a cold start) the batt light on the dash stays on/blinks constantly for like 5 mins of driving then goes away. Its never done this before and my edge insight says my batt voltage is always constantly at 13.4-13.9 volts with the batt light blinking? Do yall think this is a concern??
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,602
Likes: 148
From: SE Georgia
is your alt a reman Ford unit or a aftermarket unit?
Ford uses very specific alts in their vehicles. Some even have the same casing, but the internals are different.
If you have the wrong Alt (03-04 style) on your 06, that could be causing the issue. The PCM commands the alt to charge or not. PCM might not be communicating with the alt
Ford uses very specific alts in their vehicles. Some even have the same casing, but the internals are different.
If you have the wrong Alt (03-04 style) on your 06, that could be causing the issue. The PCM commands the alt to charge or not. PCM might not be communicating with the alt
Fleet Owner
Joined: Nov 2003
Posts: 27,881
Likes: 3,595
The "I" circuit from the instrument cluster will initiate the alternator output after the glow plugs go off (single alternator).
I would like to hear more on the dfferent alternators in the early model years vs the later ones. I dont recall hearing that before.
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,602
Likes: 148
From: SE Georgia
So the PCM only commands on the dual setups? Wierd. But whatever floats the Engineers boats I guess.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
So i just got my batteries (both) replaced with duralast golds and my alternator replaced about 3 weeks ago. Last week, when ever i start my truck (when its a cold start) the batt light on the dash stays on/blinks constantly for like 5 mins of driving then goes away. Its never done this before and my edge insight says my batt voltage is always constantly at 13.4-13.9 volts with the batt light blinking? Do yall think this is a concern??
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Lead Driver
Joined: Feb 2011
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From: L.A. (Lower Alabama)
Here's a link to a thread from a couple of weeks ago. Not exactly the same problem but lots of good info. Be sure to follow the links in the thread.
https://www.ford-trucks.com/forums/s....php?t=1098907
https://www.ford-trucks.com/forums/s....php?t=1098907
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Post Fiend
Joined: Sep 2005
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From: Ohio
No i havent cleaned the two main grounds. The alternator is an aftermarket alternator. I took the alt up to autozone to have it load tested this morning. Its working like it should. I will check the plug behind the altnernator today. Thanks so far!
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Post Fiend
Joined: Sep 2005
Posts: 5,955
Likes: 9
From: Ohio
How am i sapose to get a new one when they load tested it and said it wwas fine? I think i may have another auto zone load test it. Bud, i have heard that also a couple times that autozones remaned alts are crap. So if that batt light blinkin usually means ur alts bad? Cause i know both the batteries are less then 2 weeks old.
Posting Guru
Joined: Jan 2008
Posts: 2,408
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From: Trenton, MI
You sure cable to alternator are REAL CLEAN?
On my 00 F350 it did same thing you describe it turn out it was plastic melt to cable which contact to alternator. I end use dremel to clean melted plastic off cable then after that it been great and alternator were cooler.
On my 00 F350 it did same thing you describe it turn out it was plastic melt to cable which contact to alternator. I end use dremel to clean melted plastic off cable then after that it been great and alternator were cooler.
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
You sure cable to alternator are REAL CLEAN?
On my 00 F350 it did same thing you describe it turn out it was plastic melt to cable which contact to alternator. I end use dremel to clean melted plastic off cable then after that it been great and alternator were cooler.
On my 00 F350 it did same thing you describe it turn out it was plastic melt to cable which contact to alternator. I end use dremel to clean melted plastic off cable then after that it been great and alternator were cooler.
the light went away for a week and then Boom back on all the time
so I went with a 190 amp from DC Power with the wire upgrade no more issues
heres a pic of it all
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