Product Description
Custom Autosound USA-740 IN DASH AM/FM for Buick
Buick is a fashionable car marketed by General Motors as a Premium automobile under its luxury vehicles category. Buick has the particular division of being the first-born active American marque of vehicle of all times. General Motors had many divisions, such as Chevrolet, Cadillac, Oldsmobile, Pontiac and Buick. All had their good and bad points and every one had classics. Buick has been around for decades and has amassed many car collectors over the years. Buick always bridged the high dollar cars of Cadillac with the more down to earth offerings from Chevy but Buick had a style all its own. Buick could bring just the right amount of class into each car. Always adding a bit of flavor to spice things up.
Custom Autosound USA-740 Classic Car Radio With Bluetooth USA-740 Radio with Bluetooth Features:
- AM/FM Radio Bluetooth, USB & Auxiliary Inputs
- Option to Add CD-1, Single CD Player
- Bluetooth is Built Into the Radio
- Fits in your Original Dash Opening Without Cutting
- 3.5mm Aux Input on Front of Radio
- RCA Aux Input On Back
- Change Display Lettering Color
- Digital Tuner
- RDS Song/Artist Information
- 5 Channel RCA Pre-Outs w/ Subwoofer Control
- Separate Bass & Treble Control
- 5 EQ Presets
- Fader and Balance Control
- 15 FM & 10 AM Pre Sets
- Seek/Scan Function
- Back by a 2 Year Warranty from the Manufacturer
Now, the elegance and classical aspects on the outside need to get equally reached on the inside as well. With that being said, the potential of a new and custom Autosound USA-740 radio merging on the interior of such a classic, beats the highest expectations. In the '50s Buick came out with some of the most stylish cars anywhere. They were big but not too big, long but not too long and they were sadly overlooked by many a classic car nut. The sound quality at that time as long with the technology, were far beyond of what can be found nowadays. We, at Vintage Car Radio, help the collector of such a beauty, enjoy the define details that make this car unique, while enjoying today’s most advanced technologies on sound systems.
The USA-740 offers some appealing options that will make any profound collector fall in love. Some magically hidden amenities include:
- Bluetooth capabilities
- USB ports
- Single Compact Disc Player
- Custom fitted units (no cutting required)
- Multiple display color options
- Digital capabilities for the tuner
- Five Channel Pre-Outs (RCA) with separate Subwoofer Control
- Isolated Bass and Treble Controls
And the list goes on!
The mid '50s brought about the age of the fin and Buick didn't disappoint. Buick built some really big and really chromed out hulks but they did so with style that many other manufacturers couldn't keep up with. But as always, no matter how much the manufacturer put into the car, there was always something that you could do to make it better. That mission was accomplished to meet today’s standard of design and technology. The dream now is complete: you can have one of the most famous American classic cars sounding spectacularly amazing from the inside out.
USA-740 IN DASH AM/FM for Buick: Your Questions Answered
Will it fit my Buick without cutting the dash?
This version is built for the Buick and is made to fit the factory radio opening. Custom Autosound says its radios fit without altering or cutting the original dash.
Can I add a CD player or Bluetooth?
Yes. The options include Single Slave CD.
What else should I know about the USA-740?
There are two auxiliary inputs, a front mini jack and a rear RCA. Custom Autosound rates it at 300 watts peak, and it adds hi-volt 4-channel RCA pre-outs plus a subwoofer line-out.
Which add-ons are offered with this radio?
Add-ons offered here are 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).
Why does the order ask about factory air?
Select Yes or No under Factory Air so we send the correct setup for your Buick's dash.
Will it work with a 6-volt system?
The order form has Voltage (12 volt and 6 volt) and Ground (Negative and Positive) options, so set them to match your Buick.
USA-740 specifications
- Bluetooth built in (streaming and hands-free calling)
- 300 watts peak power (45W x 4 RMS, 2-ohm stable)
- AM/FM stereo tuner
- 2 AUX inputs (3.5 mm front and RCA rear)
- USB port
- Direct control for optional CD-1
- 5-channel RCA pre-outs including subwoofer pre-out and control
- 15 FM and 10 AM presets
- 7-color LCD with dimmer; RDS station/song/artist display
- DSP EQ; auto-store presets
- Electronic tuning and volume; separate bass/treble; 4-way fader; L/R balance
- Power antenna lead; digital clock
- USA/EUR/JAP/RUS tuner capability (USA default)
- Custom Autosound 2-year manufacturer warranty
USA-740 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-740 extras
Expect antenna, USB, microphone (Bluetooth), CD-1, and subwoofer RCA connections in addition to front/rear line outs. Use the front 3.5 mm AUX or rear RCA AUX for wired sources.
Suggested order for a classic Buick
- 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 Buick
- This radio is sold for the factory Buick 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-740 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 Buick USA-740
Will this fit my classic Buick without cutting the dash?
It is built for the original radio opening used on classic Buick 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-740 for streaming and hands-free calling.
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.
