BEC/spektrum sr300 question

[Beej]

When using the castle BEC with a standard spektrum SR300 receiver do you plug the BEC into the AUX plug and the ESC in the THR plug as usual?

 

[el_Fernando]

You can use any available open plug.

 

[altd896]

You can use any available open plug.

so long as you first remove the red wire from the esc plug, you can't have both the bec & the esc supplying power to the reciever.
Don't cut the esc wire, use a pointed tool (a hobby knife works well) to release the terminal from the connector, lift the little black plastic tag where the copper connector is showing & pull the wire back

fold the wire back & tape it up, on most esc you'll need to be able to put it back to be able to re-program the esc.