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#885650 - Sat Sep 29 2012 09:16 PM Re: charging system won't... [Re: tomctomc]  
truckernix  Offline
Joined: Mar 2002
Posts: 8,821
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!


#885665 - Sat Sep 29 2012 10:22 PM Re: charging system won't... [Re: tomctomc]  
Hotrod Lincoln  Offline
Extreme Gabster
Joined: Feb 2004
Posts: 14,635
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


Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"


#885705 - Sun Sep 30 2012 02:30 AM Re: charging system won't... [Re: tomctomc]  
tomctomc  Offline
Shop Shark
Joined: Jun 2006
Posts: 784
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


#885716 - Sun Sep 30 2012 06:28 AM Re: charging system won't... [Re: tomctomc]  
truckernix  Offline
Joined: Mar 2002
Posts: 8,821
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!

#885736 - Sun Sep 30 2012 08:28 AM Re: charging system won't... [Re: tomctomc]  
tomctomc  Offline
Shop Shark
Joined: Jun 2006
Posts: 784
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...


#885795 - Sun Sep 30 2012 12:22 PM Re: charging system won't... [Re: tomctomc]  
Hotrod Lincoln  Offline
Extreme Gabster
Joined: Feb 2004
Posts: 14,635
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


Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"


#885800 - Sun Sep 30 2012 12:53 PM Re: charging system won't... [Re: tomctomc]  
Kurt_51carryall  Offline
Shop Shark
Joined: Aug 2011
Posts: 889
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


#885817 - Sun Sep 30 2012 01:25 PM Re: charging system won't... [Re: tomctomc]  
Hotrod Lincoln  Offline
Extreme Gabster
Joined: Feb 2004
Posts: 14,635
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


Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"


#885820 - Sun Sep 30 2012 01:41 PM Re: charging system won't... [Re: tomctomc]  
tomctomc  Offline
Shop Shark
Joined: Jun 2006
Posts: 784
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.


#887077 - Fri Oct 05 2012 10:54 AM Re: charging system won't... [Re: tomctomc]  
tomctomc  Offline
Shop Shark
Joined: Jun 2006
Posts: 784
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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