How to get 12 volts from a Cessna 310?

Morgans wrote:

I'm admitting that I'm not the world's best when it comes to those
electrons, all running around helter skelter, but I thought a dropping
resistor only worked with a certain sized (constant) load. If you checked
voltage at the plug with a volt meter, you would come out with 24 volts; if
you checked it with the lighter going, you would come up with 12 volts.
Right?

That being the case, you have to use a converter, or a regulator, or
something. I don't know. Anybody?

You're limiting the current to what the lighter could digest...

Undo the lighter power, wire that to the voltage converter input, wire
the output of the voltage converter to the lighter input. Remove the
dropping resistor from the circuit, whereever its located. The panel
breaker should already be sufficient to supply power for its new role...

If its a certified airframe, get your mechanic to sign it off...