The circuit looks fine, but there is not enough information:
What are the yellow wires for
(the ones connected to the red wires on the input and output)?
They are not fitted on the same JD1230 30A power supply that I looked at:
The exposed male connector blade should really be fitted to the Blender, LED wires and "Transformer" input, which are not "Live" when disconnected. This would prevent the possibility of shorting out the power supply or motor if the connectors were accidentally pulled apart during use.
The "24-12V transformer" has to be a DC-DC converter type
(like the one shown in the photo) rather than the more commonly found coil transformers which would only work with AC power.
Presumably, the LED is rated for 12V use, or else it would require a suitable current limiting resistor to run from the 12V output.
I'm also not sure that the diode
(along with its additional 0.6V drop) is really necessary, unless you intend to have a 12V battery connected in parallel with the 12V output.
11.4V is a lot less than the typical 13.8~14.5V usually available on a car's auxiliary electrical supply while its engine is running, and would not be high enough to charge a 12V battery
(if fitted).
Alan