Home » Public Forums » GMCnet » Alternator charges until warm then stops charging
| Alternator charges until warm then stops charging [message #352518] |
Sun, 01 March 2020 14:21  |
C-lover
Messages: 1
Registered: February 2020
Karma: 0
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Junior Member |
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Hello All! I'm new here and this is my first post!
I'm hoping to draw from the experience from the community to understand why the alternator in my 76 Palm Beach charges are over 14 volts for about 5 minutes and then stops charging all together.
Ideas for a fix? I'm looking into a single pole alternator replacement...
Thanks in advance!
Ben
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| Re: Alternator charges until warm then stops charging [message #352520 is a reply to message #352518] |
Sun, 01 March 2020 16:49  |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Hi Ben,
I went to the single wire alternator and I really like it. But you will need to replace your stock battery isolator to a battery combiner. I went with a marine style combiner.
If your Thinking about changing it, might as well do it now.
Scott.
Blue Sea Systems SI-ACR Automatc Charging Relay - 12/24V DC / 120A https://www.amazon.com/dp/B000OTIPDQ/ref=cm_sw_r_cp_tai_UWdxEbRJX87VP
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
[Updated on: Sun, 01 March 2020 16:51] Report message to a moderator |
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| Re: Alternator charges until warm then stops charging [message #352521 is a reply to message #352518] |
Sun, 01 March 2020 17:26 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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The internal Voltage regulator increases trim with decrease in temp and decreases Voltage trim as temp rises. Yours may he bad and over reacting. How did you come to this conclusion.? Where are you metering if so? I would start by cleaning connections on 2 pin that feeds internal regulator just to rule that out.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Alternator charges until warm then stops charging [message #352530 is a reply to message #352518] |
Mon, 02 March 2020 11:24 |
bwevers
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
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Senior Member |
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I agree with John. It sounds like the thermistor inside your voltage regulator is failing.
Usually my alternator puts out 14.5 volts when cold and then drops to 13.8 as it warms up.
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose
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| Re: Alternator charges until warm then stops charging [message #352531 is a reply to message #352518] |
Mon, 02 March 2020 16:00 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Senior Member |
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My experience has been the positive jumper from the diode bridge to the output terminal get loose in the poorly designed stud and insulator that goes through the housing, when it get hot it get loose, and the looser it gets, it gets hotter, the loose then hotter just an endless cycle, Mine actually eventually burnt into inside.
Had to get a jumper from a scrap alternator and came up with an insulator setup that could be tightened up, the best bet I think is the one wire alternator now available, when the time comes I'll go to that.
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: Alternator charges until warm then stops charging [message #352534 is a reply to message #352518] |
Mon, 02 March 2020 18:19 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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One thing you might check. If you can get it to fail, meter the voltage into the isolator and out of the isolator on both terminals. It only takes a minute to check all 3. Use the the aluminum plate the isolator is mounted on for the negative lead of your meter.
I am thinking that maybe one of the diodes in the isolator is braking down as it warms up.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Alternator charges until warm then stops charging [message #352535 is a reply to message #352531] |
Mon, 02 March 2020 18:00 |
Eric Mears
Messages: 5
Registered: May 2017
Karma: 1
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Junior Member |
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Good write up on the differences between a one wire and a three wire
alternator here:
http://www.madelectrical.com/electricaltech/onewire-threewire.shtml
Eric
On Mon, Mar 2, 2020 at 2:01 PM Skip Hartline via Gmclist <
gmclist@list.gmcnet.org> wrote:
> My experience has been the positive jumper from the diode bridge to the
> output terminal get loose in the poorly designed stud and insulator that
> goes
> through the housing, when it get hot it get loose, and the looser it gets,
> it gets hotter, the loose then hotter just an endless cycle, Mine actually
> eventually burnt into inside.
> Had to get a jumper from a scrap alternator and came up with an insulator
> setup that could be tightened up, the best bet I think is the one wire
> alternator now available, when the time comes I'll go to that.
>
> Skip Hartline
>
> --
> 74 Canyon Lands, FiTech,
> 3.7 FD, Manny Tranny,
> Springfield Distributor,
> 2001 Chevy Tracker Ragtop Towd
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Alternator charges until warm then stops charging [message #352537 is a reply to message #352521] |
Mon, 02 March 2020 20:20 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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Bruce
Tried to open the Delco service manual and a banner read Do not have
permission to down load.
Do I have to sign up to get the information?
On Sun, Mar 1, 2020 at 4:26 PM John R. Lebetski via Gmclist <
gmclist@list.gmcnet.org> wrote:
> The internal Voltage regulator increases trim with decrease in temp and
> decreases Voltage trim as temp rises. Yours may he bad and over reacting.
> How
> did you come to this conclusion.? Where are you metering if so? I would
> start by cleaning connections on 2 pin that feeds internal regulator just to
> rule that out.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Alternator charges until warm then stops charging [message #352539 is a reply to message #352538] |
Tue, 03 March 2020 05:29 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Thanks Bruce
😀😀
On Mon, Mar 2, 2020 at 10:22 PM Bruce Hislop via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Sorry Bruce, Try this one:
> http://www.gmcmhphotos.com/photos/data/6522/Delco_Alternator.pdf
>
> --
> Bruce Hislop
> ON Canada
> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
> My Staff says I never listen to them, or something like that
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: Alternator charges until warm then stops charging [message #352540 is a reply to message #352518] |
Tue, 03 March 2020 07:14 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Bruce Hislop question having done several Delcotrons over the years. Is there a correct procedure for separation of the case without getting the brushes stuck on the slip rings? I understand the reassembly with brush retainer wire "tool" or spray straw. Seems more difficult to get them apart on newer units like CS144. Last time I cracked brush holder and had to replace. They don't address this in the writeup. Thanks.
John Lebetski
Woodstock, IL
77 Eleganza II
[Updated on: Tue, 03 March 2020 07:24] Report message to a moderator |
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| Re: Alternator charges until warm then stops charging [message #352543 is a reply to message #352518] |
Tue, 03 March 2020 09:27 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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C-lover wrote on Sun, 01 March 2020 15:21Hello All! I'm new here and this is my first post!
I'm hoping to draw from the experience from the community to understand why the alternator in my 76 Palm Beach charges are over 14 volts for about 5 minutes and then stops charging all together.
Ideas for a fix? I'm looking into a single pole alternator replacement...
Thanks in advance!
Ben
Ben,
Welcome to the group, family, cult, asylum......
While there has been a lot of discussion, I would like to know more about how you determined that it has stopped charging. Things like where you are measuring 14 volts and with what? This does not mean I doubt you, it just means that we might be able to better determine the cause and the best cure.
Speaking of cures, a single wire alternator is not a cure for anything and it will leave you with a less capable electrical system. I have done a lot of boat work for owners. Most of it was transforming racing sloops into performance cruisers. That means installing a comfortable house electrical system among other things. While combiners and neat and trick and stuff, over the years I have replaced many more of those than isolators.
The small frame 27SI alternator is a very capable machine. In cold situations, the 80Amp version can kick out 98 (measured) for short periods. What I would like to see would be the voltage at the alternator output (also the center pole of the isolator) when you think it has stopped charging. If it has actually shut down, that is the regulator as Bruce suggested.
Now, back to Ben for a moment. This is a community of helping and very supportive people the like of which is very rare. You will quickly learn that just about everybody here has a not-so-hidden agenda. That agenda is to see that you get to understand an and enjoy what your coach can be and do for you. It is a lot more than just a big new toy because it connects you to this community. The only way to annoy these people is to not pay attention to what get written here. We have a few original owners and many with decades and several hundred thousand miles of experience. They want to help. If you have a problem and one is in striking range, he may just show up to be a friendly mentor.
To this end and as you are working the forum, please fill in a sigfile. To do this, go up to <Control Panel/Account Settings> and then down to <Preferences>. There you will fine a "Signature" box. Please fill in a real name because all we have is Ben, then a bit about the coach. We have 76 Palm Beach but does it have any important mods that may matter? Finally, a geographic reference so that if you have help nearby, they will know it too. (And you may get an invite to join a local chapter. If you do, try to meet up with them.)
I told you that this was a supportive community, and the only one I have ever known like this is that of the watermen that are my world. For that reason. I like to welcome new owners here with a paraphrase of the welcome you would get there. So,
May the Good Lord bless this coach and all those that set forth within her.
Welcome Ben
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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