help with over charging problem
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Posting Guru
Joined: Aug 2004
Posts: 1,826
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From: Round Rock, TX
help with over charging problem
first off - howdy guys. Haven't been on much - havent really been modding much or having problems.
So let me preface this by saying this truck has dual 110 amp alternators. Had to replace the batteries recently, and I'd just turned 200,000 miles so it was time to check. Both alternators failed on the bench so I replaced them both.
I have an aftermarket volt meter in my gauges as well, and it was starting to jump up into the red (14+) volts in the morning. It only did it intermittently. After a week or so, it was getting worse, so I swapped the alternator.
Fast forward a month, it started doing it again. This time it PEGGED the aftermarket and OEM volt meters. One early morning it did it so bad it blew out all my headlights !!!!
I took the top alt back in and it failed the test, so I replaced it again.
This morning while driving home, I noticed it jumping up a little bit again into the "yellow" area on my voltmeter showing a slight overcharge. This is a brand new alternator, brand new batteries.
Is there something else in control of the voltage / output that could be failing ????
So let me preface this by saying this truck has dual 110 amp alternators. Had to replace the batteries recently, and I'd just turned 200,000 miles so it was time to check. Both alternators failed on the bench so I replaced them both.
I have an aftermarket volt meter in my gauges as well, and it was starting to jump up into the red (14+) volts in the morning. It only did it intermittently. After a week or so, it was getting worse, so I swapped the alternator.
Fast forward a month, it started doing it again. This time it PEGGED the aftermarket and OEM volt meters. One early morning it did it so bad it blew out all my headlights !!!!
I took the top alt back in and it failed the test, so I replaced it again.
This morning while driving home, I noticed it jumping up a little bit again into the "yellow" area on my voltmeter showing a slight overcharge. This is a brand new alternator, brand new batteries.
Is there something else in control of the voltage / output that could be failing ????
Logistics Pro
Joined: Jun 2005
Posts: 4,243
Likes: 16
From: AZ
first off - howdy guys. Haven't been on much - havent really been modding much or having problems.
So let me preface this by saying this truck has dual 110 amp alternators. Had to replace the batteries recently, and I'd just turned 200,000 miles so it was time to check. Both alternators failed on the bench so I replaced them both.
I have an aftermarket volt meter in my gauges as well, and it was starting to jump up into the red (14+) volts in the morning. It only did it intermittently. After a week or so, it was getting worse, so I swapped the alternator.
Fast forward a month, it started doing it again. This time it PEGGED the aftermarket and OEM volt meters. One early morning it did it so bad it blew out all my headlights !!!!
I took the top alt back in and it failed the test, so I replaced it again.
This morning while driving home, I noticed it jumping up a little bit again into the "yellow" area on my voltmeter showing a slight overcharge. This is a brand new alternator, brand new batteries.
Is there something else in control of the voltage / output that could be failing ????
So let me preface this by saying this truck has dual 110 amp alternators. Had to replace the batteries recently, and I'd just turned 200,000 miles so it was time to check. Both alternators failed on the bench so I replaced them both.
I have an aftermarket volt meter in my gauges as well, and it was starting to jump up into the red (14+) volts in the morning. It only did it intermittently. After a week or so, it was getting worse, so I swapped the alternator.
Fast forward a month, it started doing it again. This time it PEGGED the aftermarket and OEM volt meters. One early morning it did it so bad it blew out all my headlights !!!!
I took the top alt back in and it failed the test, so I replaced it again.
This morning while driving home, I noticed it jumping up a little bit again into the "yellow" area on my voltmeter showing a slight overcharge. This is a brand new alternator, brand new batteries.
Is there something else in control of the voltage / output that could be failing ????
Thread Starter
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Posting Guru
Joined: Aug 2004
Posts: 1,826
Likes: 1
From: Round Rock, TX
I've checked the grounds .. they're as tight as possible.
What else could it be. Now what I have noticed is this is only in the morning after it's sat overnight, and with my headlights on. Later on in the day there's no problem ... I'm beating my head on the wall with this one...
What else could it be. Now what I have noticed is this is only in the morning after it's sat overnight, and with my headlights on. Later on in the day there's no problem ... I'm beating my head on the wall with this one...
still plays with trucks
Joined: Mar 2004
Posts: 1,743
Likes: 3
From: Twin Falls Idaho
Tight doesn't mean its good. Run a 6 or 8 guage ground wire from the alt mount up to the batt Neg.
Barney
Barney
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