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Posted by David Sherman on Monday, March 30, 2009 at 21:34:00 :
In Reply to: Question for you electrical whizzes posted by Tim Holloway on Monday, March 30, 2009 at 21:15:30 :
Theoretically, it ought to work because the dual-coil design compensates (somewhat) for low or high voltage. In practice, it either doesn't compensate well enough or there torque to overcome friction, because it doesn't work. It would be easy enough for you to try it, in case you have better results, but it didn't work for me.
If you're handy with electronics, and you care that much about it, you can build a 12 to 24 volt converter pretty easily these days with a switching power supply chip and half a dozen passive components on a piece of vectorboard. You might even be able to get a "flying capacitor" voltage doubler to work since the gauge doesn't draw much current. Either way it means designing and fabricating a small electronic circuit.
I have seen higher power 12/24/12 switching converters sold for use on boats, so if you wanted to go the turn-key route, that would be an option, plus then you'd have enough juice to run a few other 24 volt devices.
I suppose another option would be to try to swap the guts of a 12 volt gauge in place of those of the 24 volt one. I have no idea what sort of donor gauge would work or how hard it would be to do the swap.
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