I have a 1990 240sx, the stereo previously in the car was an after market. So all i have is wires hanging out.
Does anyone know where i can find a guide?
Thanks in advance,
i did a write up on zilvia.net a few years ago its in the faq section if you cant find it pm me and i’ll send you a copy
Here Ya Go: 
+12V DC Battery(Constant) Red/black
Switched Accessory Blue
Illumination Red/blue
Dimmer Red/yellow
Left Front + Blue/white
Left Front - Blue/yellow
Right Front + Brown
Right Front - Brown/white
Left Rear + Red
Left Rear - Green
Right Rear + Blue
Right Rear - Pink
TEST your wires… every time somebody asks this questions they end up asking why things stop working.
It’s because people short out the constant to the chassis and wonder why it doesnt work.
Tape up the Constant and Acc.
Also watch out fot the ILL. Wire (Blue/Red) many people short that out and
wonder why thier dash lights don’t work. Reason being you just blew your TCU.
unplug batt = prevent shortings?
i got a spare tcu for who ever needs hahahahaha
Slightly harder to find the right wires if you don’t have/don’t trust the wiring codes… not sure how you would find the +12 constant wire with the battery disconnected. If you do connect up all the wires and you have them wrong and then plug the battery back in you could damage the radio.
this was good timing i was putting in my deck this week
Go to any Futureshop/Bestbuy or other Stereo Shop
and get a Nissan Harness it’s $15 and it plugs right in.
No messing around… Plug and Play
On a little side note guys the 240sx harness doesn’t have a ground in it
you 1) have to tap in a new one somewhere on the chassis or 2) do what
Nissan did and not hook it up and use the Antenna as the common ground.
hey i need to install a factory cassette player into my 89…
- previous deck was just cut out
2)i have the factory wire harness its kinda short but i wanna just cut and attach it like that
im sure this is very simple but if sumone could help by giving a breef installation guide that would be very helpful…cuz of course i havint done this before.
thanks alot and whoever can help wth this please pm me. thanks alot
There are a couple diagrams on the internet.
I cannot remember where I found them and Google is not being helpful today.
I have them printed out and somewhere lost in my glovebox. Anyone want it scanned, PM me.
Ok this came back to me while brushing my teeth this morning so I decided to post immediately before I forget it again.
http://www.bagotronix.com/nissan_240sx_stereo.pdf
And Google this is for you in case someone else is looking for this info:
Nissan 240sx s13 deck wiring Nissan 240sx s13 deck wiring Nissan 240sx s13 deck wiring Nissan 240sx s13 deck wiring Nissan 240sx s13 deck wiring Nissan 240sx s13 deck wiring
Always try a search before you ask a question… most likely it has already been answered.
http://www.son240sx.ca/forum/viewtopic.php?t=5591&highlight=