Garage
Shop

See all parts that fit your 2003 Astro

NVX XBG3PK

1/0 Gauge 100% OFC (Oxygen Free Copper) Big 3 Upgrade Kit for Audio Sytems Up to 350 Amps

NVX
Shop all NVX
Out of stock
Product videos
highlight-star-icon

• Upgrade Your Factory Power and Ground Wire
• Perfect for Dealing with Dimming Lights
• Improve the Efficiency of Your Vehicle's Electrical System
• Use for Systems 350A or Less
• Includes All Necessary Wiring
• Ring Terminals are Pre-Connected to Power and Ground Wire

Learn more about the xbg3pk
Universal fit Icon

Universal – fits most vehicles.

Similar items | Update vehicle | Vehicle store
List price $119.99
Thanks , You Pay:
-8%

$109.99

 with warranty
Starting at $10/mo or 4 payments of $28 Buy now, pay later and installment payment plans are offered by Afterpay and Affirm. Learn more

Heads up

Your vehicle can use this product in multiple locations. Only a quantity of one can be selected from the product page. You will have the option to adjust the quantity within your cart.

Dollar Icon
VIP Product Get $11.00 in rewards to spend later
Quantity
Out of stock - Order risk-free, cancel any time.
Brand new

Acima Logo

No Credit Option

Flexible Lease Payments

Early Purchase Options

Quick Approval Decision

Extend logo

Keep your product protected longer! Extend the warranty after the manufacturer warranty expires. 

  • Hassle-free immediate replacement within minutes!
  • Easy online claims 24/7
  • Covers product breakdowns and failures
Swoosh Icon Icon of Swoosh

For over 25 years, we've been your X-Factor – the team dedicated to having the biggest impact on your shopping experience!

Award winning icon
Award-Winning Service
Shipping icon
FREE Shipping Orders $49+
60 days return policy icon
60-Day Easy Returns
lowest price guarantee icon
Guaranteed Lowest Price
inHouseExpert
In-House Experts

Loading...
72-4568 main

Metra 72-4568

Install New Speakers in select 1990-2021 vehicles from Chevrolet, GMC, Buick

120
-33.36%

$9.99

List price $14.99

40-GM10 main

Metra 40-GM10

Connect your factory antenna to a new aftermarket radio for select 1958-2023 vehicles from GMC, Chevrolet, Pontiac

45
GM1483B main

Scosche GM1483B / GM1483 Dash Kit

Install a new Single-DIN car stereo in select 1995-2023 vehicles from GMC, Chevrolet, Cadillac trucks (Black)

119
-54.55%

$6.34

List price $13.95

70-1858 main

Metra 70-1858 Wiring Harness

Install a new car stereo in select 1986-2006 vehicles from Chevrolet, GMC, Pontiac

63
95-3005 main

Metra 95-3005 Dash Kit

Install a new Double-DIN car stereo in select 1996-2005 Astro and Safari

4
-10.72%

$49.99

List price $55.99

iLX-W650 main

Alpine iLX-W650

7" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto (SiriusXM Ready)

124
-5.72%

$329.95

List price $349.95

DMH-1800NEX main

Pioneer DMH-1800NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready

2
-16.67%

$349.99

List price $420.00

UTE-73BT main

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth (SiriusXM Ready)

43
-16.69%

$149.95

List price $180.00

Limited time!
CAR1013 main

Jensen CAR1013

10.1" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto

5
-11.43%

$309.99

List price $349.99

Limited time!
KW-V660BT main

JVC KW-V660BT

6.8" Double DIN CD/DVD Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)

10
-16.70%

$399.00

List price $479.00

Product Highlights


• Upgrade Your Factory Power and Ground Wire
• Perfect for Dealing with Dimming Lights
• Improve the Efficiency of Your Vehicle's Electrical System
• Use for Systems 350A or Less
• Includes All Necessary Wiring
• Ring Terminals are Pre-Connected to Power and Ground Wire

Description


NVX brand icon

Authorized dealer



Product Details:

  • 1/0 Gauge X-Series Big 3 Upgrade Kit
  • Made from 100% Oxygen-Free Copper (OFC)
  • Tinned conductors for corrosion resistance
  • Pre-terminated seamless power and ground ring terminals provide reliable performance
  • Full spec power and speaker wire meet or exceed American Wire Gauge standards
  • CEA-2015 and BC5W2 compliant
  • Includes an assortment of wire termination hardware and cable ties
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Kit includes:

  1. One 6 ft. Frosted Blue 1/0 gauge power wire with seamless crimp ring terminal
  2. Two 4 ft. Frosted Black 1/0 gauge power wire with seamless crimp ring terminal
  3. Ten Black Nylon Cable Clamps
  4. Ten 1/2" #8 Wafer Head Tek Screws
  5. Ten 8" Black zip ties
  6. Three 1/0 Gauge Nickel Plated ring terminals
  7. Three Heat Shrink tubes with the NVX logo

Frequently Asked Questions (FAQ)


The Big 3 reduces resistance but doesn't create power. If your alternator output is lower than your system's draw, dimming may persist. However, check your charging wire fuse; if it's blown, your system isn't seeing the upgrade's benefits.
Connect the 1/0 gauge wire directly from the alternator’s positive post to the battery’s positive terminal. Do not remove the factory wiring. Adding this wire alongside the original creates a larger path for current to flow safely.
For vehicles with a Regulated Voltage Control sensor, you must run your new 1/0 ground wire through the sensor loop before attaching it to the battery. Bypassing this sensor can cause charging errors or a "check charging system" light.
The engine block is often oily or painted. Use a wire brush to clean the mounting bolt area to bare, shiny metal. A poor engine ground is a leading cause of "alternator whine" and inconsistent voltage readings at your amplifier.
While the 1/0 wire is heat-resistant, avoid direct contact with the exhaust manifold or moving belts. Use the included cable clamps and zip ties to secure the wire along the firewall or factory wire looms to prevent the insulation from melting.

Loading...
BV850ACP main

Boss Elite BV850ACP

6.75" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto with Backup Camera

5
iLX-W650 main

Alpine iLX-W650

7" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto (SiriusXM Ready)

124
-5.72%

$329.95

List price $349.95

DMH-1800NEX main

Pioneer DMH-1800NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready

2
-16.67%

$349.99

List price $420.00

DMH-W4660NEX main

Pioneer DMH-W4660NEX

6.8" Double DIN Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Android Auto (SiriusXM Ready)

2
-20.00%

$599.99

List price $750.00

BMV62W main

Belva BMV62W

6.2" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto and Phone Mirroring

28
-66.67%

$89.99

List price $269.99

CV15BT main

Cerwin-Vega CV15BT

Single Din Digital Media Receiver with Bluetooth

3
Limited time!
DMH-W3050NEX main

Pioneer DMH-W3050NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto, and Built-in Alexa (Sirius XM Ready)

1
-24.20%

$469.99

List price $620.00

KW-M560BT main

JVC KW-M560BT

6.8" Double-DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)

10
UTE-73BT main

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth (SiriusXM Ready)

43
-16.69%

$149.95

List price $180.00

Limited time!
DMX709S main

Kenwood eXcelon DMX709S

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)

20
-33.50%

$399.00

List price $600.00


This product is temporarily out of stock. May we recommend...

BBG3KT small

Belva BBG3KT

• Upgrade Your Factory Power and Ground Wire
• Perfect for Dealing with Dimming Lights
• Improve the Efficiency of Your Vehicle's Electrical System
• Use for Systems 250A or Less
• Includes All Necessary Wiring
• Ring Terminals are Pre-Connected to Power and Ground Wire

(48)

$49.99

List price $79.99

Specifications & Details


Big 3 upgrade Kits Specifications
Power/Ground Wire Size
1/0 gauge
Power Wire Length
6 feet
Power Wire Color
Blue
Ground Wire Length
4 feet
Ground Wire Color
Gray
Complies to AWG Standards
Yes
Wire Material
OFC (100% Oxygen-Free Copper)
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

NVX

Model Number:

XBG3PK

Weight:

6.40lbs

Internal SKU:

xbg3pk

Internal Product ID:

86029

Product and How-to Videos


  • NVX 100% OFC Power and Ground Wire | Amp Installation Kits & Big 3 Kits
  • How To Install the Big 3 Upgrade | Improve Your Vehicle's Electrical Charging System | Car Audio

Customer Ratings & Reviews


NVX XBG3PK thumbnail image

5 star
91%
4 star
4%
3 star
2%
2 star
1%
1 star
1%



Durability
4.9
Value
4.8
Features
4.9
Design
4.9
Usability
4.8

Customer Reviews

Sort by:

Loading...

Great for the Price

Thick 4700 strand. Not as thick as Knu but it is so much cheaper and it is well worth the money. Great product. Heat shrink is a little dinky and lugs have small holes so it wasn't easy to find grounds.

By Jake on August 4, 2014

166 found this helpful


Good Quality

Helps upgrade your stock cables to run your system better

By Johnny on November 9, 2014

163 found this helpful


Does what it should!

I purchased this big3 because I needed to upgrade to 1/0 alt wiring for the 320amp DC alt coming in. Kit has everything you need besides a fuse and block, nice flexible high quality ofc wiring and sturdy terminals. Even on the stock alt just adding this wiring increased my output and really helped stabilize my voltage. Something that just about any audio system can benefit from.

By Robbie on August 14, 2014

159 found this helpful


Love it

I ran this kit in a 2009 Aveo5 lt and it was very easy to work with and had plenty of wire to use. It made a major difference in the electrical system. I am running 2 Dc audio 12 inch level 4's and a hifonics 2400.1 d class amp and a hifonics 640.4 and not headlight dimming since I put this in the car.

By Smurf turf on October 28, 2014

151 found this helpful


Awesome kit

This kit has the same amazing high strand silver tinned copper that NVX uses in their amp kits. It is super flexible and easy to work with. The ring terminals that are included i noticed are made of copper with some kind of chrome coating, and they are very good quality. You will need some sort of crimping tool though. The only thing I didnt like is they suggest that you put a fuze within 12 feet of your battery on the battery wire but there isnt one included with this kit but otherwise it is awesome.

By Machapu on June 26, 2014

152 found this helpful


Great !!!

Good quality I will recommend this nvx product to anybody for the 3 upgrade

By fidel on August 14, 2014

151 found this helpful


Great kit

This big three kit is awsome. I like how only one end of each wire has a terminal crimed on and not on both ends. Having the extra terminals to crimp on your own allows for a custom cut and crimp. I install car audio as a hobby for many of my friends and family. As well as their friends and relatives. I have used many kits, or custom made my own. This kit is extremely convenient and easy to use. It allows for custom cut and no need to purchase anything extra. Everything you could possibly need for a big three upgrade is in this kit. The wires are extremely flexible and will turn into tight corners. I like to hide as much wire as possible as I like a clean look. These wires were more than what I hoped and was looking for. I will most definitely be looking for spools of this wire for future audio installs.

By Michael on January 11, 2015

147 found this helpful


OK

its a nice true gauge ofc product that in my opinion is worth the price

By dain on November 23, 2014

146 found this helpful


Big 3 done

Great wires, easy to install and gauge to spec, fits 0 gauge fittings perfectly. I also bought the NVX battery terminal connectors. Very happy with the quality of their products. Ended up with about 4FT extra wire.

By Jarred on August 10, 2014

139 found this helpful


big 3 kit

this is a great kit. I bought off ebay a 8 ton crimper to crimp the lugs that needed to be crimped after you get them to length. This kit fit perfectly over my new mechman alternator lug. The big 3 kit now gives me all the power I need. The wires were plently long enuff and install was so easy. Buy it...it just works.

By Honkytonkman on February 18, 2015

132 found this helpful



KB-6524PS small

SHARP KB-6524PS 24 Inch Microwave Drawer Oven

24 Inch 1.2 Cubic Foot Microwave Drawer

$751.85

List price $899.99

MPC-I101-2C-4M small

Monster Cable MPC I101 2C-4M

13.12 ft. (4 meters) of interlink 101 XLN Standard Car Audio Interconnect RCA Cable

(2)

$18.00

List price $29.99

AF45 Extra Virgin AF451-1-05 small

AudioFly AF451105 (Extra Virgin)

45 Series Sound Isolating In-Ear Headphones With In-Line Mic

$29.99

List price $69.95

HN092HR-TAN small

Nextour HN092HR (TAN)

2 Custom Universal TAN Leather Headrests with Built-in 9.2" TFT-LCD Monitors

$249.99

List price $899.99

APBD740 small

Black & Decker APBD740 Spacemaker 12-Cup Coffee Maker

12-Cup Programmable Spacemaker with Programmable Options

$74.99

List price $140.00

No picture

DS18 PRO-HY6.4MSL (Open Box, Great)

300W Peak (150W RMS) 6.5” Shallow Hybrid Midrange with built-in driver

$55.97

List price $79.95

XA-REDPW2-65 small

JL Audio XA-REDPW2-65

65 ft. Spool of Red 2 Gauge Wire

$129.99

List price $199.99

KKP 3 10 small

Ground Shaker KKP 3 10

10" Triple Ported/Vented Pro Solo-Baric Subwoofer Enclosure

$159.95

List price $269.95

MTG10UHD small

Audiovox MTG10UHD

10.1" HD Digital Overhead Monitor with Built-In DVD Player, HDMI Input, USB Reader

$199.99

List price $371.23

Related Searches


Save up to 10 different vehicles in your garage
Vehicle
Store
Delete

2003 Chevrolet Astro

2013 Ford Edge

2011 BMW M3

2011 Saab 9-3X

1992 Ford Probe

Add vehicle Clear all vehicles
Where to find vehicle info
Are you sure you want to clear your garage?
This action cannot be undone. Confirm
This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue
Loading...
Identify your vehicle and submodel details
  • Owner's manual
  • Vehicle's insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon

Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.