Frequently Asked Questions
⚡ What Is a Big 3 Wiring Upgrade Kit?
If you're pushing serious power through your car audio system, your factory wiring isn't gonna cut it. The Big 3 Wiring Upgrade is all about strengthening your vehicle’s electrical foundation by replacing three key wires:
- Battery ground to chassis
- Engine ground to chassis
- Alternator positive to battery
This improves current flow, reduces voltage drops, and keeps your amps and lights from cutting out when the bass hits. If you're running a high-output alternator or multiple amps, this upgrade is a must.
🤔 Are Big 3 Upgrade Kits the same as Amp Install Kits?
Nope, totally different beasts.
Big 3 Upgrade Kits are all about giving your electrical system a serious boost—upgrading the three key wires:
- Battery ground to chassis
- Engine ground to chassis
- Alternator positive to battery
This helps stabilize voltage, reduce strain, and prevent power drop-offs when you're pushing serious wattage. Basically, it beefs up your system’s foundation so your amps and subs don’t suffer.
An Amplifier Install Kit, on the other hand, includes:
- Power & ground wires (usually longer runs to reach your amp)
- RCA cables
- Speaker wire
- Remote turn-on wire
- Fuse holder & ring terminals
So if you're wiring up an amp for the first time, grab an Amp Install Kit.
If you already have gear installed and your system needs more stable voltage? That’s where the Big 3 comes in.
🛒 Need Amp Kits too? Check out our Amplifier Wiring Kits
🚗 Why Upgrade Your Vehicle's Electrical System?
Because your car's stock wiring was designed to run factory speakers—not upgraded subwoofers, multi-channel amps, DSPs, underglow, and whatever else you’ve got going.
The Big 3:
✅ Reduces resistance
✅ Increases power flow
✅ Prevents headlight dimming
✅ Helps alternators perform better
✅ Protects your amps from voltage drops
It’s cheap insurance for the stuff you already spent money on.
🧰 What’s in a Big Jeff Big 3 Kit?
Every kit is slightly different depending on the brand and spec, but most include:
- 1/0 or 4 AWG OFC power & ground wire
- Fuse holder & fuse
- Heat shrink tubing
- Ring terminals
- Wire loom
- Zip ties
We carry top brands like Audiopipe, Full Tilt Audio, and DS18—all quality-tested and daily-driver approved.
🛠️ Do I really need the Big 3?
If you’re running aftermarket amps and pushing serious power—yes. If you’re still rocking factory sound with no big draw? Probably not. But once you start throwing down 1000W+ RMS, don’t be surprised if your lights dim or your voltage drops. Big 3 helps fix that.
⚡ OFC vs CCA – Which is better?
OFC (Oxygen-Free Copper) is the premium option:
- Better conductivity
- Lower resistance
- More durable long-term
CCA (Copper-Clad Aluminum) is more affordable but not as efficient. If you’re serious about performance and running high wattage, go with OFC.
