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No, the 12 VDC light must have a DC supply and the transformer voltage as well as being 16 volts which is too high, the output is AC.
Change the trailer light bulbs to 24 volts and supply a 24 volt source to power them, in that order.
step up transformer
No, you will need to get a step up transformer, it's probably more sensible to get a 12v sensor.
The conductor for H2 connection on a 480 volt wire transformer should be marked:
yes
No, the 12 VDC light must have a DC supply and the transformer voltage as well as being 16 volts which is too high, the output is AC.
Look at it and find its weight. If it is heavy it contains a transformer and is dimmable. If it is very light and obviously contains no transformer, it can't be dimmed.
Answer for countries in Europe and other world areas running a 50 Hz power supply service. This depends on the the light or globe, if you can replace just the globe its very simple. change over the globe and buy yourself a mains(230v or 115v) to 12v isolation transformer, and attach that to the mains cable and run a cable from the 12v to the globe and away you go. The description of how to change the mains to 12v is the same if you have to replace the whole light. Then you just have to replace the globe or the whole light assembly.
Yes.
Change the trailer light bulbs to 24 volts and supply a 24 volt source to power them, in that order.
If the load you are connecting to the transformer uses 1.5 amps or less, yes.
No, it will destroy the 3 volt device.
They will only weakly glow. Make a rising transformer if it is AC, if DC it is still possible to make an amplifier.
step up transformer
Use a voltage devider or a transformer.
By the volt metre.