Product Description
Custom Autosound USA-850 for a Mercury
Custom Autosound USA-850 for Mercury – The Perfect Blend of Classic and Modern
For Mercury enthusiasts, keeping the original look and feel of their classic car is essential. However, factory radios from past decades lack the features that today’s drivers expect. The Custom Autosound USA-850, available from Vintage Car Radio, offers the perfect solution—modern sound and connectivity while maintaining the factory appearance of your Mercury’s dashboard.
Modern Features with a Classic Look
The USA-850 is packed with features that bring your Mercury into the modern era without compromising its vintage appeal. One of its biggest advantages is built-in Bluetooth, allowing you to stream music wirelessly from your smartphone or tablet. You can also take hands-free phone calls, making communication on the road both safer and more convenient.
For those who still love traditional radio, the AM/FM tuner with 30 presets ensures you’ll always have access to your favorite stations. The USB and auxiliary inputs provide even more ways to enjoy your music, whether through an MP3 player, flash drive, or other external device. The USA-850 is also CD changer compatible, giving you multiple options for playback.
Powerful Sound, Easy Installation
With 300 watts of power (75 watts per channel), the USA-850 delivers high-quality sound that far surpasses the factory radio. Additionally, the four-channel RCA pre-outs and subwoofer output allow for further upgrades to your sound system.
Designed to fit seamlessly into your Mercury’s dashboard, the Custom Autosound USA-850 provides the ideal balance of classic style and modern performance. If you're looking for the best way to upgrade your Mercury’s audio system while preserving its original look, Vintage Car Radio has the perfect solution with the USA-850.
Specifications
• 4 programmable screen options
• Working analog dial
• Custom Fit In Dash
• 6-volt RCA Pre-Outs and dual subwoofer pre-outs
• DSP EQ
• Subwoofer control
• Bass, treble, mid
• Fader/balance
• Loudness on/off
• CD Controller
• RCA AUX in
• Bluetooth
• 75W X 4 Peak (300W max)
• PLL Tuner
• Power Supply 12 VDC negative ground
• Speaker impedance 2-8
• 4 lbs shipped
• Shipping box 12 X 11 X 5
• Fits all CAS current applications (400+)
USA-850 for a Mercury: Your Questions Answered
What does the USA-850 for a Mercury fit?
Our vehicle search lists it for the Mercury Comet and Mercury Cougar. Use the vehicle search to confirm your exact car.
Can I add a CD player or Bluetooth?
Yes. The options include Single Slave CD.
How does the USA-850 handle phone audio and connections?
It streams music and takes calls over Bluetooth. The DigaDial display gives you 4 screen choices, including a classic analog dial with a red needle that glides across the stations, or an all-digital RDS display.
My Mercury is 6-volt or positive ground. Can I still use this?
The order form has Voltage (12 Volt and 6 Volt) and Ground (Negative and Positive) options, so set them to match your Mercury.
What features does the USA-850 have?
It has a rear RCA input and controls the optional CD-1 single CD player, and installation uses a simple 3-wire power harness. You can adjust bass, treble and midrange or choose a DSP EQ preset (Flat, Classic, Pop or Rock).
Can I buy speakers and an antenna at the same time?
You can add a front dual voice coil speaker, a rear 6x9 speaker pair (Custom Autosound 6x9 Speaker Pair and Upgraded Pioneer Speaker Pair), and an antenna (Hideaway Antenna and Power Antenna) right from the options above.
USA-850 specifications
- DigaDial selectable display (including working analog-style dial and digital RDS views)
- Bluetooth built in (streaming and hands-free calling)
- 300 watts peak power (75W x 4 peak)
- AM/FM stereo tuner with RDS
- 25 presets
- USB port for MP3/WMA/FLAC/WAV playback and phone charging
- Rear RCA auxiliary input
- Direct control for optional CD-1
- 6-volt RCA pre-outs plus dual subwoofer pre-outs
- Bass, midrange, and treble; DSP EQ (Flat, Classic, Pop, Rock)
- Front/rear fader and left/right balance; loudness
- Power antenna lead; digital clock
- 12V negative-ground; 2–8 ohm speakers
- Designed for original classic dash openings (vehicle-specific faceplate)
- Custom Autosound 2-year manufacturer warranty
USA-850 wiring and tech tips
Use this as a head-unit reference for power, ground, antenna, speakers, and amplifier connections. Always match the printed diagram that ships with your unit if it differs.
Power and ground (typical Custom Autosound harness)
| Function | Wire color |
|---|---|
| Ignition / ACC +12V | Red |
| Battery / constant +12V | Yellow |
| Ground | Black |
| Power antenna | Blue |
Ignition and power-antenna leads are commonly fused at 1A on the harness—confirm against the guide that ships with your radio.
Speaker wiring (typical)
| Speaker | Wire color |
|---|---|
| Left front + / − | White / White-Black |
| Right front + / − | Gray / Gray-Black |
| Left rear + / − | Green / Green-Black |
| Right rear + / − | Violet (or Purple) / Violet-Black |
USA-850 extras
Expect antenna, USB (playback and phone charge), Bluetooth microphone, optional CD-1 control, 6V front/rear RCA pre-outs, and dual subwoofer pre-outs. Use the rear RCA AUX for a wired player. Pick your DigaDial display style in the radio menu after power-up.
Suggested order for a classic Mercury
- Disconnect the vehicle battery before any wiring.
- Connect ground first, then constant (yellow) and ignition (red).
- Connect the antenna plug and the blue power-antenna lead if your car has a power antenna.
- Wire all four speakers, matching polarity.
- If using an amplifier, run RCA cables from the front/rear (and sub on USA-740/USA-850) pre-outs.
- Reconnect the battery and test radio, speakers, and charging system voltage.
Tech tips for classic Mercury
- This radio is sold for the factory Mercury opening used in classic models—do not cut a modern DIN rectangle if you want a stock look.
- A poor ground is the most common cause of whine or weak audio; scrape paint at the ground point and use a star washer.
- If AM reception is weak, check the antenna mast, cable continuity, and that the antenna plug is fully seated.
- Vintage Car Radio does not install radios. If you are not comfortable with 12V wiring, use a qualified installer.
USA-850 manuals
Download the manufacturer guide for operation, safety, and the official wiring diagram. You can also browse our full library on the Manuals page.
Vintage Car Radio does not offer installation. The manuals are for do-it-yourself reference or to share with your installer.
Two-Year Custom Autosound Warranty
All Custom Autosound radios sold by Vintage Car Radio are backed by a 2-year manufacturer warranty from Custom Autosound.
Radios are checked before shipping. If something is wrong out of the box or under warranty, call us at 844-802-4499 or 574-226-6676 and we will help coordinate with the manufacturer.
Vintage Car Radio does not offer installation services. Refer to the Manuals and Wiring / Tech Tips sections for manufacturer guidance, or use a qualified car-audio installer.
FAQ — classic Mercury USA-850
Will this fit my classic Mercury without cutting the dash?
It is built for the original radio opening used on classic Mercury models. Compare your dash opening and bezel to the product photos. We do not modify dashes in-house.
Does this radio have Bluetooth?
Yes—Bluetooth is built into the USA-850 for streaming and hands-free calling. The DigaDial display also offers selectable classic dial and digital views.
Do I need an amplifier?
Many owners run speakers directly from the radio. Pre-outs are there if you want more volume or a subwoofer later.
Do you install the radio?
No. Vintage Car Radio ships the unit and documentation; installation is DIY or by a shop you choose.
What is the warranty?
Custom Autosound radios include a 2-year manufacturer warranty. See the Warranty section for details.
Need help?
Call 844-802-4499 or 574-226-6676.
Specs
Wiring / Tech Tips
Manuals
Warranty
Two-Year Custom Autosound Warranty
All Custom Autosound radios sold by Vintage Car Radio are backed by a 2-year manufacturer warranty from Custom Autosound.
Radios are checked before shipping. If something is wrong out of the box or under warranty, call us at 844-802-4499 or 574-226-6676 and we will help coordinate with the manufacturer.
Vintage Car Radio does not offer installation services. Refer to the Manuals and Wiring / Tech Tips sections for manufacturer guidance, or use a qualified car-audio installer.
