Mustang Retro Sound Retro Classic Chrome AM/FM Radio (1965-1966) Installation Instructions

Tools Required:
  • 3/8-inch Ratchet
  • 1/2-inch & 5/16-inch Deep Sockets
  • 1/2-inch Wrench
  • Phillips Head Screw Driver
  • Wire
  • Wire Strippers
  • Crimpers
  • Ring & Butt Connectors
  • Wire Taps
  • Small Pick
  • Multimeter or Test Light
Install Difficulty:
  • Moderate
  • Moderate Project
1. Before you install your new Mustang Retro Sound RC-900C W/RS-6466MUSTKT Retro Classic Chrome AM/FM Radio you will need to remove your old radio. Since my car did not have a radio before, I wasn’t able to take pictures for the removal, but it is very simple. If it is a standard push knob style, simply pull the knobs off, remove the retaining nut, gently slide it out from behind, and disconnect the wiring. If it’s not a knob type, then removal will vary by make and model.
2. If your dash is cut or damaged, now would be the perfect time to replace it with a new Mustang dash panel assembly. Mine is damaged but not badly enough to need to do this. If you do replace your dash panel assembly, adjust your radio to it before you install it in the car so you will avoid having to install it and remove it multiple times. I don’t recommend using the replacement panel just to adjust the radio because your dash will very likely not be the same dimensions and the fit will be slightly off.
3. Open your box to make sure all of the Retro Sound parts are there; they are: the radio itself, the faceplate, knobs, a bag of hardware, a bag of plastic spacers, two brackets, the main harness, the power and speaker secondary harnesses, the control stalks, and a metal strap. Note that because the radio comes in a kit not everything will be in the same box.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
4. Loosely attach the brackets to the sides of the radio. They will need to be adjusted later.
5. Now put the face plate on. (This will be removed and replaced many times during the installation). Put one of the stalks though the bracket and faceplate. Adjust the bracket until the shaft is straight and can be moved back and forth freely. Remove the stalk, tighten down the screws bracket and repeat on the other side. Note don’t be tempted to copy the other side. They will need to be adjusted differently for each of these steps.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
6. Now it’s time to install the stalks. They can be done individually or at the same time, whichever you prefer. Open the hardware bag. Thread one of the 1/2-inch nuts down to the bottom of the stalk, and then place a washer over it. These will set the depth of the stalk coming from the dash.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
7. Replace the stalk in the Mustang radio and place it in the dash. You may need to loosen the brackets and adjust them slightly. Measure the amount of thread coming through the dash. There should only be enough thread for one the 1/2-inch nuts to make one or two turns, about 1/8-inch.
8. Adjust the nut on the base of the stalk forwards or backwards as needed. Repeat step 7. Adjust as necessary. You will end up doing this multiple times.
9. Once you have to depth of the stalk set properly, remove the faceplate and place a washer, then a nut over the stalk. Don’t over tighten it; it just needs to be snug with the wrench.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
10. Now we need to fix the faceplate to the radio. Like before, thread a nut down the stalk and place a washer on top of that, but don’t tighten them yet. Replace the faceplate and open the bag of spacers. Tighten the nuts you just placed against the faceplate. You now need to measure the space between the two sets of nuts and fill that space with appropriately sized washers. In my case I didn’t need to use any since one set of nuts rested against each other, and the other was too small a space to fit a spacer. Each application will be different.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
11. Now place a washer then a nut in the front of the faceplate. Snug them down with the wrench, but don’t over tighten. This completes the assembly of the radio body.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
12. On the back there is a place to thread in a stud to secure the metal strap. I didn’t use this but if I notice the radio shaking excessively I’ll secure it from the back.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
13. Place the radio in the dash and place a washer then a nut on each stalk to secure it. Again, don’t over tighten them. Note the grooves in the front and rear stalks. Line the knobs up with these and slide them onto the stalks. They may be a tight fit, but they go on if you lined them up right. Don’t force them if they won’t go on. If necessary, you pry the ends of the stalks open by GENTLY inserting a flat blade screw driver into them.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
14. Now it’s time to set up the Mustang electrical & wiring. The radio will need a 12v constant, 12v switched, and a ground. Don’t attach the wires from the harness to the car directly; use the butt connectors to connect the harness to wires for power. I put a ring terminal on a piece of wire and used that to ground mine under the dash. Anywhere that’s a good ground will work.
15. You have many options to find the 12v constant. You can run a wire to the Mustang battery directly, but I would recommend against it unless you have an existing hole to the firewall you easily accesses. I have a horn button on my dash that runs directly to the battery, so I simply used a wire tap to connect the 12v constant to it. To find a 12v constant, with the battery connected turn the car off and use the multimeter to 12v. Make sure to disconnect your battery before making the connection.
16. The easiest way to get the 12v switched is off the Mustang ignition switch. To remove it, turn the key to accessory, insert the pick in the small hole, and turn it one click past accessory. The tumbler should slide out.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
17. To remove the switch, push the back in and turn counter-clockwise. The bezel will fall out the front and you will be able to pull the switch out from behind. Note in the picture I have the instrument cluster removed. This not necessary for the Retro Sound radio installation, but will make access a lot easier. Once the switch is out attach the power wire to the back.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
18. Replace the ignition switch in to the dash the opposite way it came out. Connect the three wires to the power harness. On the power harness there are two blue wires, one for a power antenna and one for an amp pre-out. Unless you have those components don’t remove the black caps on them.
19. Now it’s time to wire up the speaker harness. This harness is easy. Simply make sure that each speaker wire goes to the correct wire on the harness. Right now I only have Mustang speakers in the rear package tray.
Mustang Retro Sound Retro Classic AM/FM Chrome Radio Install Image
20. Plug both secondary harnesses into the main harness. They will only go in one way so don’t try to force them if they don’t go in. Plug the main harness into the back of the radio and plug the cable from the Mustang antenna into the large black wire.
21. Congratulations! You’re done! Time to enjoy your Mustang Retro Sound Retro Classic Chrome AM/FM Radio!