Many on this site are old enough to remember the proverbial neighborhood ‘fixit shop’, where you could take your toaster, etc. to be repaired. Few could have envisioned (back when Y-Block equipped cars/trucks were still rolling off the Dearborn assembly lines) a world where it was cheaper/more convenient to merely toss expensive appliances rather than bother to get them fixed.
My impression is that regulator adjustment is largely a lost art. Assuming your bench-testing instruments are accurate/properly calibrated, you posses the specialized tools/knowledge, and calculate all considerations (temp. variation, cover position, metal fatigue, etc., not to mention the value of your time/labor), will the result likely be any improvement over the quality control testing standards of whatever Chinese factory is routinely supplying your trusted parts supply source?

Whatever. I may just clean up the contacts and throw the old regulator in my used parts bin, since it isn’t really the kind of part you would need to buy new anyway to carry around as an emergency backup (unless for a long/cross country trip) since smart battery charger/maintainer use has become much more commonplace, and even if the gen. fails, a fully charged Optima battery will take me most anywhere (by daylight) I need to go, AND back.

6 VOLTS/POS. GRD. NW INDIANA

"In the 60's Sears sold only riveted covers so no adjustment could be made.": Others did too. I just drilled-out the rivets & replaced with sheet-metal screws.

Regards, JLB 


55 Ford Crown Victoria Steel Top

Good to hear you solved the problem  More than likely the cut-out relay contacts developed a high resistance as this is what extinguishes the idiot light by providing a low resistance path around the bulb when closed. Often a little cleanup on these contacts will restore the low resistance. This may save you from possibly purchasing an off-shore regulator. Hope this helps, JEFF................


64F100 57FAIRLANE500

If you decide to adjust your regulator by bending the spring tabs holding the tension, always put the cover on after the adjustment to check with your meter. I have never found one yet that didn't change with the cover not in place. In the 60's Sears sold only riveted covers so no adjustment could be made.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Update: Installed my back-up regulator....problem solved! Gen. light totally dark now under full load (radio, brights, heater fan full blast, accelerating in underdrive), except for just the very faintest blink when the OD hold-in coil activates for that micro-second before the pull-in coil releases. Regulator points don’t really look burnt/corroded, so I’m assuming it just went out of adjustment over time. I COULD clean it up, get out my voltmeter and try to adjust it, but since it is old/worn and regulators are relatively inexpensive, I’ll likely just order another new backup and be done with it. Too bad there isn’t a 6V solid state model available that would be an OEM/bolt-in fit.

6 VOLTS/POS. GRD. NW INDIANA

I’ll start with swapping regulators (simplest approach) and take a nighttime drive to see if the gen. light is dimmer under heavy current draw. If no difference, then I’ll get out the manual/voltmeter and proceed from there. I’m familiar with rebuild routine (done a couple), and have some pre-Asian brushes and a NOS commutator put away just in case. Hope the endplate bushing is still good though.
Thanks for the help.

6 VOLTS/POS. GRD. NW INDIANA

Correction to my previous post: Use sand paper, not emery paper when dressing contacts.  Thanks Joe-JDC for the reminder.


64F100 57FAIRLANE500

Also, if you replace the brushes again, when you clean the armature area, use a very fine sandpaper(2000-3000 grit) and spin the armature to insure a clean and smooth surface.  Use a very small knife/awl and clean the grooves of any old carbon from the brushes, and blow dry.  Make sure the new brushes come all the way out of the holder with spring tension, so that they can seat fully as they wear.  If they don't, stretch them slightly, but carefully until they do.  Reassemble and make sure the polarity is correct.  Check the voltage as suggested above and clean the points.  Joe-JDC

JDC

Don't ignore the regulator as there is just as good a chance this could be the problem. What is the system voltage at idle? Voltage with increased rpm? Shop manual lists system voltages along with how to perform  a full field test to check if the generator is capable of a good output. Often the regulator contacts will develop a powdery oxide requiring a touch with a piece of fine emery and a hit of contact cleaner wont hurt either. Do you have a known good spare regulator on hand? Hope this helps, JEFF...........................


64F100 57FAIRLANE500

I have run into a few rebuilt generator issues that have turned out to just a broken or weak brush spring. Even one that a rebuilt myself the replacement spring lasted no time, more off shore crap