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Go to your local auto store and get the Hanes auto manual for this care and they should have a wiring schematic for you to follow also you can look your new stereo up on the web and find out what each colored wire goes to what!!! Good luck
Your question is not very specific but I expect that you have discovered that Volvo does not bother to color code their sound system wiring. They seem to use whatever wire they have laying around, so there is no particular pattern, and often all the wires are the same color.
If your car still has the original stereo plugs, you can buy a wiring kit from the installation shop at Best Buy. It will have a plug that plugs into the Volvo plug and wires that are color coded to standard color coding so you can figure out how to connect it to the new stereo. I not only had to put in a new stereo, but I had to bypass the original amplifier in my '91. The kit from Best Buy made it all Plug and Play!
1994 Volvo 940 Car Audio Wire Diagram
Car Radio Battery Constant 12v+ Wire: Yellow
Car Radio Accessory Switched 12v+ Wire: Red
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Light Orange
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5 1/4′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Blue/Yellow
Left Front Speaker Negative Wire (-): White
Right Front Speaker Positive Wire (+): Gray/White
Right Front Speaker Negative Wire (-): Gray
Car Audio Rear Speakers Size: 6′ x 9′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Yellow/Brown
Left Rear Speaker Negative Wire (-): Yellow/Green
Right Rear Speaker Positive Wire (+): Green/Brown
Right Rear Speaker Negative Wire (-): Green
Hope helps (remember rated this) TY for use Fixya.
Hello. here is how you replace the front turn signal assembly on a 90-92' 740. First, twist the the black plastic collar loose to disconnect the wiring harness from the assembly. Second there should be 2 10mm bolts holding the assembly in place. just take the nuts off the bolts, then carefully pull the assembly out. Reverse the directions to install. should take about 5mins, unless the nuts are totally rusted. if so use some BP Blaster. Good luck :)
4 bolts is fairly easy remove the rear first with the seat all the way forwards and then put seat all the way back then 2 in the front remove them ..tilt the seat back and if there is any wire harness disconnect them as well ...reverse process for re-installation
you need a wire harness for your car you can buy them at most auto parts stores make sure and buy the one for your make and model they should have instructions and the wiring diagram most harnesses are color coded and pretty simple to install
You will need to go buy a wiring harness adapter from your local Walmart (usually cheapest there) or Local Electronics place (ie Best Buy). The wire harness that goes out from the radio goes into the Adapter and the adapter plugs into the car harnesses. Also these Adapters come with the wiring diagrams for your vehicle. They typically run 10 - 15 bucks depending on where you get them. Thanks for using FixYa!