Problem with New CD player and Radio

[bill@ariel231]

you are in the right track, 10V DC is probably too low to function.

not having your manual in front of me, the color codes you pulled from the manual are a good guess:

Black is ground (run a fresh lead back to the battery, keep this separate from your hull bonding system)
Yellow will provide 12V for station memory (always connected)
Red will be 12V for operate power and possibly display lighting (this should be switched)

you'll want a separate fuse for both the red and yellow lines.

if you can post the model number or the full wire list the board can offer better assistance...

good luck!