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Classic/Antique Car Repair/1955 plymouth charging system


Trying to help a friend with a 1955 Plymouth Belvedere.  The car stopped running and a "mechanic" friend brought her an 8 volt battery. The car started and ran fine until it stalled at a recent cruise. The battery was dead.  Obviously I am going to replace the battery with a new 6 volt.  I tested the generator  per the manual and seems to working fine, yet with the engine running if I disconnect the battery it stops.  My question is:
Would the 8 volt battery have burned out the voltage regulator or do you think this may have been or is the problem now?
Thanking you in advance.

It is possible that the 8 volt battery hurt the voltage regulator or I would guess that the regulator failed and that is why the jump start was needed. Now if you have tested the generator by jumping the field and it charges that points to the voltage regulator and that is the only on car test for the VR. But all points to the VR that is if all the wiring is intact.

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Brad Sears


All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.


Automotive tech instructor. Syndicated auto columnist 1970's though the early 1990's. Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's TV Show "Last Chance Garage" 1980's PBS-TV syndicated. Auto instructor for the following companies: Fram Autolyte Holly Carter AMF Ford Motor University Of Conn Blue Hills Technical School Sugar River Technical Center Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.

Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.

More than I care to remember. Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.

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Moto Award winner. And much more.

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