I`m trying to install a new radio into my 75 nova but i dont know much of anything about it and i dont have a car manual,if i could see a wiring diagram that tells me which wires are what (not just the colors) or hear any suggestions on installing a radio it would be great

-Nick

Hey Nick Welcome to Team Nova ;)

i'm not sure how to remove the radio faceplate on the '75 but the radio itself will have a factory plug... i believe when you buy your new stereo they'd be able to offer you a pigtail jumper plug that will permit the radio to mount to your factory harness... the original speaker wires, power wires etc... the speakers themselves can be removed/replaced and upgraded if that's also what's planned...

if a booster or amp or whatever is to be used then of course that complicates the issue... but you were asking just about radio connection, yes ???

i have all the wiring schematics saved in an album viewable by clicking the link in my signature area... locate the album, click on your schematic and enlarge that to full size... right-click-save to your files ;)

anyways, i hope i helped ya in some small way... i wish ya the best ;)


JRotten ;)

thanks for the help,i appreciate it :thumbsup: how do you see someones signature though???

look at the bottom of this post, see where it says "info/albums" ???

click on that ;).............................. right about there V

For a mono radio:
In your radio plug there should be several wires.
all black wires are ground, there may be more than one as the front speaker has a ground wire from the harness.
yellow is 12v power
gray is for the dial light and is powered thru the dash lamp circuit. This is a good place to splice in for add on gauge lights.
Light green is front speaker
dark blue would be rear speaker + and the ground goes to the body

For a factory stereo radio:
all black wires are ground
yellow is 12v power
gray is for the dial light and is powered thru the dash lamp circuit.
purple and tan wires are the + side of the front speakers
black with a double white stripe are the front speaker grounds
brown and dark blue are the + side of the rear speakers
rear speaker grounds go to the body

thanks

and where do i connect the ACC wire for controling it with the ignition

the acc wire on the radio can be hooked to the acc position of your fuse panel...

The yellow wire is hot in key on and acc positions.

"... the white zone is for loading and unloading of passengers only..."

so,i have a red wire for ACC and a yellow wire for the battery on my radio,if i hook up the yellow wire do i also hook up the red and if so where would that be? sorry,i dont know anything about installing radios

On your new radio the red will hook to the yellow in the harness, then your radio will go on/off with the key. The yellow on the radio needs to go to a constant 12v source to save the presets and clock memory. See where the blue plug is installed in my fuse panel? That is a hot spade and you can plug your yellow wire in there.

http://i80.photobucket.com/albums/j199/64elcamino/77%20Nova%20project/electrical/fusepanel.jpg

ok,how do i hook the yellow wire to the hot spade in the fuse panel? and would i plug it in above the label for ACC or batery on the fuse panel? :confused: i want to make sure i dont mess anything up

Plug it in above the BAT where the blue plug is in the photo.

oh,um,theres already a plug in that one,and the yellow wire doesnt have a plug on the end its just a bare wire,thanks for the help tho,i dont mean to bother you so much

What is plugged into it? and you can install a female spade end on any wire.

well,it looks just like ur picture with whatever it is thats plugged in on urs,im going to bed but i can take pics of what im working on tommorrow if that would help???

If it looks just like mine there is nothing being powered, it is a just a condenser plugged into the circuit. You can hook the yellow wire into the open spade connector and it will be fine.

for a mono radio what exactly is the gray wire for?

and i need to make the yellow wire longer,do i need to get a specific type of wire?

Buy stranded copper wire the same size as the yellow one. Cut a little piece off and take it with you to compare. The gray wire is for the light in the stock radio dial. It dims with the panel lights. Pick up some butt connectors and both male and female spade terminals and a crimping plier to attach the ends to the wires. This tool will be extremely handy in the future as well as for this project. If you go to Radio Shack and tell them what you are doing they will get you the right stuff.