I have a 1953 Commander that's been converted to 12 volt negative ground. Are there 12 volt solenoids available or can I put a resistor in-line? Does the polarity make a difference with a solenoid?
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The solenoid doesn't care about the polarity, neither do the governor or the relay. Both the solenoid and the relay do care about the voltage however. A resistor will not work for the solenoid because of the difference in amperage draw between the pull-in and the hold-in positions.
The good news is that the 12v solenoids will bolt right up. If you get a "three terminal" one from a from a late car, you can do away with the relay. You can just wire it up like, say, a '64 using your existing kickdown switch and governor. Details of that are in the late shop manual. All the vendors have solenoids. -
They are available in 12 V Neg Ground as the transmissions were used well into the 60s after the automakers shifted to 12-volt. Here's a link to a Parts House that has them. They are expensive, but if you have trouble finding one you know where to go as a last resort!
Classic Car Parts for Studebaker - 6-12 Volt Conversions (vintageautogarage.com)
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You can do better than than that. Studebaker vendors have them for around $240.
https://www.studebakerparts.com/stud.../store/s/elecj3H-C5 "The Blue Goose"
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