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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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