Under the hood wiring question

[rtpatter]

I need to wire a Bluetooth receiver under the hood that operates the RGB headlights. However, I don't want to mount it directly to the battery as the receiver itself would be a constant drain on the battery. Is there anything under the hood that I can easily wire it to that would shut off power to the receiver once the key is out of the ignition?
Thanks

 

[CO_Hunter]

Add a fuse to key controlled circuit Acc or On would be easy. May or may not need a relay as well.