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#885650 - Sat Sep 29 2012 04:16 PM Re: charging system won't... [Re: tomctomc]
truckernix Offline
Registered: Sun Mar 24 2002 12:00 PM
Posts: 8305
Loc: Bracebridge Ontario Canada
Jerry,
my suggestion of removing the armature wire was to allow testing of the generator without any other influences. I thought this might take some of the mystery out of the situation.

_________________________
1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
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#885665 - Sat Sep 29 2012 05:22 PM Re: charging system won't... [Re: tomctomc]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 11330
Loc: Dellrose, TN
The only time I run a generator with the wires disconnected is when I'm checking for residual voltage. Grounding the field with nothing connected can cause a major voltage spike- - - -30+ volts in a matter of a second or two. Once the battery gets into the circuit after the cutout relay closes, it acts like a shock absorber to dampen out big voltage swings.
Jerry
_________________________
My best friends are Sam, Eli, Bill, and Gene:
Samuel Colt
Eliphalet Remington
Bill Ruger
Eugene Stoner

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#885705 - Sat Sep 29 2012 09:30 PM Re: charging system won't... [Re: tomctomc]
tomctomc Offline
Shop Shark
Registered: Fri Jun 09 2006 12:00 PM
Posts: 654
Loc: Northeast Massachusetts
I will run the tests(s) later today and report back. Is there any mechanism where the generator would pass the motoring test and yet fail as a generator? thank you for the help.

Tom
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#885716 - Sun Sep 30 2012 01:28 AM Re: charging system won't... [Re: tomctomc]
truckernix Offline
Registered: Sun Mar 24 2002 12:00 PM
Posts: 8305
Loc: Bracebridge Ontario Canada
I would say that if the generator was polarized backwards, that would be the case. I think this could happen if one were to motor it with the polarity reversed. By the way I have never tried this.
_________________________
1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
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#885736 - Sun Sep 30 2012 03:28 AM Re: charging system won't... [Re: tomctomc]
tomctomc Offline
Shop Shark
Registered: Fri Jun 09 2006 12:00 PM
Posts: 654
Loc: Northeast Massachusetts
OK - first piece of data: the "no leads connected" generator test showed the generator putting out 16V and headed up when the field terminal was grounded. Same behavior at the regulator - as expected as the wiring is new. looks like my generator is good. its hard for me to believe that i got 3 bad regulators, but i will focus my attention on that part. by the way - what is the proper Delco Remy part number for the Voltage Regulator? i have the the 25A generator. i think i want to go OEM with the next regulator I try...
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#885795 - Sun Sep 30 2012 07:22 AM Re: charging system won't... [Re: tomctomc]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 11330
Loc: Dellrose, TN
It looks like any of the following D-R regulators will work:

Output Amperage:36-42
(Edit: The current regulator can be adjusted to work with the 25-amp generator on any of these. Jerry)

Application: Delco Generators

Buick 1955-62, Cadillac 1955-62, Chevrolet 1955-62 Equiped With Delco Generator

Reference Numbers: Delco 1118277, 1118337, 1118338, 1118389, 1118739, 1118740, 1118745, 1118885, 1118886, 1118887, 1118888, 1118889, 1118890, 1118929, 1118930, 1118948, 1118973, 1119004, 1119163, 1119266, 1119275, 1119600, 1119602, 1119609, 1119610, 1119623, 1119627, 1119629, 1119630, 1119633, 1119637, 1119638, 1119639, 1119640, 1119648, 1119654, 1119655, 1119660, 1119661, D619, D623, D625, D627

My mid-1950's Delco-Remy service bulletin book lists the #1118825 regulator as the standard replacement item for regular-duty 12 Volt generator regulators. I'd also reccomend using an original-equipment Delco regulator, not one of the repops from overseas!

Edit #2: There are literally dozens of NOS Delco-Remy regulators on ebay right now, with various applications listed. Any of them can be adjusted to match your 25-amp generator, so don't automatically reject one that lists a 35-42 amp rating if the price is right. It's a simple spring tension change on the coil behind the ARM wire. It will make no difference at all where the max voltage setting is concerned.
Jerry
_________________________
My best friends are Sam, Eli, Bill, and Gene:
Samuel Colt
Eliphalet Remington
Bill Ruger
Eugene Stoner

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#885800 - Sun Sep 30 2012 07:53 AM Re: charging system won't... [Re: tomctomc]
Kurt_51carryall Offline
Shop Shark
Registered: Sat Aug 27 2011 09:29 PM
Posts: 889
Loc: Raleigh,NC
I know this may sound stupid, but did you bring the RPMS up with the gas as you were checking both charge and voltage? The generator will typically not charge at low idle.

When I got my wiring harness, the schematic was incorrect and had the amp meter hooked up backwards.

I have also had odd thing happen with old batteries where they would not show a charge at the gauge. I would for sure borrow a known good battery from your car and try that before I did anything else.

Kurt
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#885817 - Sun Sep 30 2012 08:25 AM Re: charging system won't... [Re: tomctomc]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 11330
Loc: Dellrose, TN
There are some really lousy-quality imported regulators on the market now, so getting three bad ones in a row doesn't surprise me. Have you had any of them apart, at least removing the cover? Some of the repops are actually solid-state items with few, if any mechanical parts, while others are just cheap-quality mechanical regulators with springs and points inside like the originals. Some of those will respond to adjustments, but it's better to start with a good-quality original-equipment item.
Jerry
_________________________
My best friends are Sam, Eli, Bill, and Gene:
Samuel Colt
Eliphalet Remington
Bill Ruger
Eugene Stoner

Top
#885820 - Sun Sep 30 2012 08:41 AM Re: charging system won't... [Re: tomctomc]
tomctomc Offline
Shop Shark
Registered: Fri Jun 09 2006 12:00 PM
Posts: 654
Loc: Northeast Massachusetts
Kurt - yeah i had the rpms up.. no dice. the ammeter shows proper discharge when the lights or other load is turned on. I know i am not charging because the battery voltage doesn't change with the engine on or off.

Jerry - these are cheesy looking mechanical repops.. i am going to get a OEM Delco Remy... i bet that does the trick.

thanks for keeping the ideas coming.
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#887077 - Fri Oct 05 2012 05:54 AM Re: charging system won't... [Re: tomctomc]
tomctomc Offline
Shop Shark
Registered: Fri Jun 09 2006 12:00 PM
Posts: 654
Loc: Northeast Massachusetts
Bill wins - there was indeed a wiring problem. i checked for continuity from the generator to the regulator, and it was (apparently) there. what a continuity check won't show you is if there is a short in the path. i read 0 ohms from the armature wire at the generator to the other end at the regulator, implying a complete circuit. I decided to read the resistance to ground of the armature wire and found that there was also 0 ohms from each end to ground. The wire was pinched under a bolt on the firewall shorting it out. when i repaired the short, the charging system returned to proper operation. thanks for all the help.

Tom
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