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59 suddenly stops charging?

Started by Cadillac Jack 82, February 22, 2024, 11:02:38 PM

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Cadillac Jack 82

February 22, 2024, 11:02:38 PM
Everything is new on the car including wiring. While testing both the battery and gen they seem okay. Guess the Standard 35 amp voltage regulator just crapped the bed?  Made it home but those lights were dim. Thoughts?
Tim

CLC Member #30850

1959 Cadillac CDV "Shelley"
1964 Cadillac SDV "Rosalie"
1966 Oldsmobile Toronado "Sienna"

Past Cars

1937 LaSalle Cpe
1940 Chevrolet Cpe
1941 Ford 11Y
1954 Buick 48D
1955 Cadillac CDV
1955 Packard Clipper
1957 Cadillac Series 62
1962 VW Bug
1962 Dodge 880
1966 Mercury Montclair
1967 Buick Wildcat Convertible
1968 Chevy Chevelle SS
1968 Plymouth Barracuda
1977 Lincoln MKV

bcroe

#1
February 22, 2024, 11:17:22 PM
Every time my 62 stopped charging, it was the GEN
brushes, regulator was OK.  Easy to check. 
Bruce Roe

Cadillac Jack 82

#2
February 23, 2024, 01:11:53 AM
Does this mean I need to take apart the Gen?  I shot dust off in there and that didn't change anything.
Tim

CLC Member #30850

1959 Cadillac CDV "Shelley"
1964 Cadillac SDV "Rosalie"
1966 Oldsmobile Toronado "Sienna"

Past Cars

1937 LaSalle Cpe
1940 Chevrolet Cpe
1941 Ford 11Y
1954 Buick 48D
1955 Cadillac CDV
1955 Packard Clipper
1957 Cadillac Series 62
1962 VW Bug
1962 Dodge 880
1966 Mercury Montclair
1967 Buick Wildcat Convertible
1968 Chevy Chevelle SS
1968 Plymouth Barracuda
1977 Lincoln MKV

Michael Petti

#3
February 23, 2024, 07:54:32 AM
Test the generator and you will know. I think it should be 13.5 or 14 volts output if I remember correctly.

Jeff Rosansky CLC #28373

#4
February 23, 2024, 09:22:02 AM Last Edit: February 23, 2024, 09:23:36 AM by Jeff Rose CLC #28373
Does the idiot light come on at all? How about when the key is on but engine isn't running?
1st thing would be to go ahead and flash it. If still no, then test the generator without the regulator. I think you ground the field wire, but Google that to be sure. If the generator is good it should run away with rpm. Then check the ground on the regulator.  Then clean the points in the regulator (battery disconnected of course).
There may be other troubleshooting tips in the manual.
Good luck
Jeff R
Jeff Rosansky
CLC #28373
1970 Coupe DeVille (Big Red)
1955 Series 62 (Baby Blue)
Dad's new 1979 Coupe DeVille

Dave Shepherd

#5
February 23, 2024, 11:28:29 AM
Quick check on the gen is to momentarily  ground the field terminal on the gen., it would go to full output say 14-15volts., this eliminates the regulator.

Cadillac Jack 82

#6
February 23, 2024, 12:43:50 PM
Well after further testing its the Gen. Shame because it's been fully rebuilt and restored. My question is what would cause it to suddenly crap out?  I ordered from a different vendor this time and hopefully this time no more boo boos.  I'd like to enjoy my 59 and not have a pretty lawn ornament...
Tim

CLC Member #30850

1959 Cadillac CDV "Shelley"
1964 Cadillac SDV "Rosalie"
1966 Oldsmobile Toronado "Sienna"

Past Cars

1937 LaSalle Cpe
1940 Chevrolet Cpe
1941 Ford 11Y
1954 Buick 48D
1955 Cadillac CDV
1955 Packard Clipper
1957 Cadillac Series 62
1962 VW Bug
1962 Dodge 880
1966 Mercury Montclair
1967 Buick Wildcat Convertible
1968 Chevy Chevelle SS
1968 Plymouth Barracuda
1977 Lincoln MKV

dplotkin

#7
February 23, 2024, 09:37:19 PM
Quote from: Dave Shepherd on February 23, 2024, 11:28:29 AMQuick check on the gen is to momentarily  ground the field terminal on the gen., it would go to full output say 14-15volts., this eliminates the regulator.
Except that on an AC car with a double contact regulator will burn up the contacts. Disconnect F wire from gen and ground F post as above.

Dan
56 Fleetwood Sixty Special (Starlight silver over Dawn Grey)
60 Buick Electra six window
60 Chrysler 300 F Coupe
61 Plymouth Savoy Ram Inducted 413 Superstock
62 Pontiac Bonneville Vista
63 Chevy Impala convertable
63 Ford Galaxie XL fastback
65 Corvette convertable 396
68 Chrysler New Yorker

Dave Shepherd

#8
February 24, 2024, 07:46:47 AM
Never had to do that, musta got lucky. Lol

bcroe

#9
February 25, 2024, 09:55:20 AM
If the 2 wires to the generator were disconnected, an ohm
meter should read near zero from the main output terminal
to the case ground (through the brushes and armature).  If
it reads open circuit, brushes are gone.  Bruce Roe
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