1975 cadillac fleetwood 12v constant.

i'm installing a kenwood kdc-138. Can i run my 12v constant to my radio fuse.i havent tried hooking the 12v constant to the fuse block. i also have an accessory wire(yellow/black). it works when i use the accessory and 12v constant. when turn i turn the car off. i lose all of my presets. i want to keep my personal present and settings. im looking for another alternative to my situation. thanks in advance.k.o.d.

Check to see if your radio's yellow (constant) is going to a constant source because that would be the solution to your problem, also to be thorough, make sure you have a good ground. (Not just the antenna plug).

Is there an orange wire on the cigarette lighter socket?  If so, that should be a constant source.

@howie ll. my constant going to the fuse box. @ i am an idiot. there is a orange cig. cable. i dont kno if it will tho. i try it later and see if it work. just in case this work. whats your next solution? my manual say that the battery wire(yellow). going to the battery. my ignition wire(red) is to acc/fuse box. my power antenna is taking care of. just got replace the antenna.k.o.d.

The manual is correct.

so, i can my radio ignition wire to my fuse box.k.o.d.

You can run it to the fusebox, but there is a suitable wire on the factory radio harness.  It will be a yellow wire on the same plug with a black, grey and possibly a pink wire.

i do have a pink wire there. You kno wat the pink wire is?k.o.d.

Power Antenna

Disregard speaker size and antenna location.  This is for a Camaro but the wire colors are the same as your car.

1978-81 Chevrolet Camaro Stereo Wiring
Constant 12V+	Orange
Switched 12V+	Yellow
Ground	Black
Illumination	Gray
Dimmer	Brown
Antenna Trigger	Pink
Antenna	Windshield
Front Speakers	3 1/2" Dash
Left Front (+)	Tan
Left Front (-)	Gray
Right Front (+)	Light Green
Right Front (-)	Dark Green
Rear Speakers	6" x 9" Rear Deck
Left Rear (+)	Brown
Left Rear (-)	Yellow
Right Rear (+)	Dark Blue
Right Rear (-)	Light Blue