There's NO reason to muck around with unregulated voltage drop resistors from the age of dinosaurs.
There's all sorts of solid-state regulators available from companies that cater to classic car enthusiasts.
Or, get a cheap generic DC power supply that plugs into a cigarette lighter and has a switch to set desired voltage from Wallaby World (or equivalent) and hard-wire it and tuck it out of sight under the dash somewhere. I have done exactly that a number of times. (A "6-Volt" system operated at about 7.4 Volts with the engine running.)
You can also build your own using an IC regulator for a couple of bucks. I've done that, as well, and still have a '53 GMC truck I set up that way.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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