Just bought a '56 ply with a 6cyl motor are they 6v or 12 v . can't find any tags that say what it is ie. gen. ect Ron
The starters and generators that are 12v had green tags and the 6v had red tags, at least mine do. Lee
Google is your friend: http://www.oldcarbrochures.com/static/NA/Plymouth/1956%20Plymouth/album/1956%20Plymouth-05.html Left hand side of page down towards the bottom talks about the 12-volt electrical system
I too have a 56 Plymouth, and as others have said it is a 12 volt system, with green tags on the starter and generater. I am currently in the process of switching my 6cyl over to a 270 Red Ram poly from a 56 dodge. My six was incorrectly rebuilt by the previous owner, causing some damage, so I decided to switch her over now instead of later. I think you will lover your Savoy.
I have used 4 caps = 8 volt. Not sure, if that is the first year of 12 Volt & Neg. Ground. Cruise On.