Remote wire is blue, and goes POSITIVE when stereo switched on, a lot also have a seperate AERIAL feed that does the same, marked POWER ANT.
I have never seen a Kenwood yet that loses it's remote or aerial feed when switched to CD either.
If you phone(my mate) BOB on 01728 746100 he is the main repair centre for all of the UK for Kenwood, and does pretty much all other makes as well, the company name is FULLERS, been doing it since before the ark was made, also carry all sapres etc, and sell graded units.
tabetha