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Old 08-18-2009, 12:07 AM
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A little "clockwork"

I want to convert my 40 pontiac over to 12 volt system i want the original dash clock to work though so can I just add a resistor in the line to keep it six volts? or what should i do?
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Old 09-09-2009, 02:36 AM
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The only mechanical car clocks that I have experience with use a small solenoid to wind the clock spring back up; when it winds down to a certain point a set of contacts close together, which energizes the soleniod to wind it up again.

If yours is like this I would be concerned about the contacts wearing faster because of the higher current that the 12V will drive through the coil. You could experiment with running it through a tail lamp bulb or something similar.

You could wire a resistor in series to limit the current, I would start with something like a 10 ohm resistor. Get a resistor with 1 Watt or more power rating for durability and to have thicker leads to work with.
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Old 09-09-2009, 08:05 AM
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There are firms that market resistors specifically for this purpose. They are sized appropriately to prevent over heating.

Vince
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