Intermittent alternator operation
#2931921
06/10/21 11:10 AM
06/10/21 11:10 AM
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Joined: Jan 2003
Posts: 7,471 Minnesota
Hemi_Joel
OP
master
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OP
master
Joined: Jan 2003
Posts: 7,471
Minnesota
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Hi, on my '67 GTX the alternator operates intermittently. Sometimes it will work for 5 or 10 minutes then be off for 20 minutes or more. I replaced the regulator, that didn't do anything, I checked all the wiring and the grounds and that was okay. I brought the alternator in to a professional rebuilding shop and had it rebuilt. When it decides that it is not going to work, I can apply 12 volts to the field terminal and it does not operate. What could it be inside this alternator that could be causing this? I want to have an idea before I bring it back to the rebuild shop, because most likely they will tell me it's not the alternator it's the car.
Thanks, Joel
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Intermittent alternator operation
[Re: Hemi_Joel]
#2931932
06/10/21 11:36 AM
06/10/21 11:36 AM
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Joined: Jan 2003
Posts: 10,666 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,666
North Dakota
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Replace the bushes.
Missed the fact that it was rebuilt. The brushes would have been replaced as standard operating procedure by any competent shop. Ignore my comment.
Last edited by 6PakBee; 06/11/21 09:52 AM. Reason: Missed that.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Intermittent alternator operation
[Re: Hemi_Joel]
#2931997
06/10/21 02:18 PM
06/10/21 02:18 PM
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Joined: Jan 2003
Posts: 18,389 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,389
UPPER MICHIGAN, MARQUETTE COUN...
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Hi, on my '67 GTX the alternator operates intermittently. Sometimes it will work for 5 or 10 minutes then be off for 20 minutes or more. I replaced the regulator, that didn't do anything, I checked all the wiring and the grounds and that was okay. I brought the alternator in to a professional rebuilding shop and had it rebuilt. When it decides that it is not going to work, I can apply 12 volts to the field terminal and it does not operate. What could it be inside this alternator that could be causing this? I want to have an idea before I bring it back to the rebuild shop, because most likely they will tell me it's not the alternator it's the car.
Thanks, Joel When you field the alternator make sure there is voltage on the alternator stud. If you are losing the battery feed at the time you are fielding it the alternator will not put out.
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Re: Intermittent alternator operation
[Re: ph23vo]
#2932001
06/10/21 02:41 PM
06/10/21 02:41 PM
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Joined: Nov 2012
Posts: 86 Alabama
WarEagle1
member
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member
Joined: Nov 2012
Posts: 86
Alabama
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sounds like an intermittent open in the rotor... I've had an intermittent open like this in a square-back that drove me crazy. It happens. Many of these parts are antiques now.
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Re: Intermittent alternator operation
[Re: Hemi_Joel]
#2932002
06/10/21 02:46 PM
06/10/21 02:46 PM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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I'm going to assume it is a original single field alternator that should charge more than 12.8 volts when you turn the key on and the motor is running. What is the output voltage on the charging wire going back to the battery when it is charging?\ What voltage and amps does it put out on a test stand?" I would look closely at the voltage regulator and its ground next
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Intermittent alternator operation
[Re: Hemi_Joel]
#2932181
06/11/21 03:30 AM
06/11/21 03:30 AM
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Joined: Aug 2007
Posts: 6,089 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,089
Valencia, España
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What about if the problem is at bulkhead black wire getting into the cab? Alternator can be working but just power going anywhere, so no reading.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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