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Voltage regulator Identification #1309864 Mon May 06 2019 10:19 PM
Joined: Nov 2011
Posts: 186
1946GMCDAN Offline OP
Shop Shark
I have many new voltage regulators that came with a collection of parts. Basic, standard looking black, rectangle, delco style regulators. They all have different numbers on the backs. On the inside the all look the same. How do I tell if for 6 or 12 volts? And perhaps what trucks they go with.

Numbers include.


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Re: Voltage regulator Identification [Re: 1946GMCDAN] #1309869 Mon May 06 2019 10:49 PM
Joined: Sep 2001
Posts: 28,452
tclederman Offline
I do not know how to determine 6v vs 12v
I think you have date codes, not part numbers?

Year Month Day (Maybe?)
I do not know how to determine decade.

8 A A could be:

8 = 38 48 58
A = January
A = 1st (Happy New Year?)

Maybe someone know better/correct interpretation?

1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Voltage regulator Identification [Re: 1946GMCDAN] #1309890 Tue May 07 2019 01:12 AM
Joined: Mar 2002
Posts: 8,879
truckernix Offline
Master Gabster
The 6 volt Delco regulators that I have seen all have two screws in the covers , one in one corner and one in the opposite corner on the diagonal. The 12 volt regulators have a flange on each end at the base level. t
The cover screws are short, one on each end at the flange. This does not apply to aftermarket regulators.

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1951 1 Ton Completed

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Re: Voltage regulator Identification [Re: 1946GMCDAN] #1309895 Tue May 07 2019 01:34 AM
Joined: Feb 2004
Posts: 19,003
Hotrod Lincoln Offline
Check the cutout relay closing voltage- - - -this can be done with a simple battery and a rheostat. The regulator doesn't even have to be mounted on a vehicle. PM or email me for a more detailed description.

The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

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Re: Voltage regulator Identification [Re: 1946GMCDAN] #1309921 Tue May 07 2019 10:03 AM
Joined: Apr 2005
Posts: 2,289
coilover Offline
Shop Shark
Used to always switch to a solid state regulator on both 6v and 12v. No coils/contacts to mess with. They (used?) to make solid state kits to fit into the original housing for the purists. Think most solid state ones run about $20 on ebay. Before internal regulator alternators we used the 64-69 Chrysler one wire in--one wire out regulator on the street rods. Very small and dependable so a mounting place was easy to find.


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