I've done that between my ole Mazda Tribute and GTX. You need some somewhat special connectors for the power. I'll find a pic of them and post them up here. I have them in my Fit now, it allows you to "quick disconnect" the powe and ground without risks of wires shorting. Then jus unplug the RCA's ad away ya go
From
"The Install Bay" Part #SB120
The Install Bay
Order 2 and there's your power disconnets