Designed specifically for the Ford Ranger 4.0L OHV OEM battery setup, upgrade your automotive electrical system with our very own  12° North Industries BIG-3 WIRE KIT for high-current alternator installations up to 400A. This premium, mostly plug & play pre-assembled kit makes installation easier than ever—no soldering or crimping required. Take it to the next level with our 
 
Why Upgrade? 
The first step to unlocking real electrical performance is by upgrading the wiring. Factory cables, although often adequate, are sometimes undersized for added current needs above an extra 15-20A, can create voltage drops across positive and ground circuits and choking off the power your system could be getting. A BIG‑3 Wire Kit provides the properly sized, low‑resistance path your vehicle’s battery and components need. Once that foundation is in place, pairing it with a high‑output alternator ensures the system can deliver its full potential without bottlenecks.
 
 
Why Wire Gauge Does Matter
Electrical Load & Amperage: Wire gauge determines how much current it can safely carry. A stock alternator (80–130 amps) doesn’t demand much, but a high-output alternator (220–400 amps) can overwhelm factory wiring
High-output alternator + stock wire = bottleneck; you won’t see the full benefit.
Voltage Drop: Undersized wire creates resistance, which reduces charging efficiency. This means your battery and accessories may not receive the full benefit of your alternator upgrade
Heat & Safety: Smaller wires under heavy load can overheat, melt insulation, or even cause fires
1/0 AWG = best choice for high-output alternators, especially if you’re running winches, off-road lighting, or aftermarket audio
 
The Power of Real Copper
At 12° North Industries, we use only 100% pure oxygen free copper (OFC) cables, unlike the inferior Copper Clad Aluminum (CCA) alternatives. Here’s why:
 
 Enhanced Conductivity:  Real copper provides superior power in voltage transfer
 Compact Efficiency:  Delivers maximum performance without needing bulky or oversized wires
 Long-Term Reliability:  Pure copper cables resist wear and deliver consistent power over a longer time ensuring a far lower failure rate
 
Why Avoid CCA?
CCA cables have flooded the market and may be cheaper, but they compromise on efficiency and durability. They were also initially offered for specifically watercraft and marine applications to counter extreme oxidation situations.
 
To match the performance of our OFC cables, CCA wires must be two sizes larger—making them harder to run under carpet or through bulkheads due to a bulkier sizing and that adds to less reliable installations.
 
Kit Consists of:
4ga Cable: Alternator ~ Battery
4ga Cable: Main Power/Ground
8ga Cable: Secondary Grounds
 
 
For those who refuse to settle for ‘good enough’
 
Our BIG‑3 Wire Kit + High‑Current Alternator upgrade is designed to take your Ford Ranger’s electrical system to the next level. By combining properly sized, pure copper wiring with a direct‑fit alternator that delivers 220 amps at just 1200 RPM, you’ll unlock the kind of reliable power that factory setups simply can’t match. Installation is straightforward and plug‑and‑play, connecting directly to the Ford Ranger’s 4.0L V6 engine brackets and using the same or similar plug, so no modifications should be required.
 
This unit produces 220 amps of full output at just 1200 RPM and maintains 110 amps even at idle, giving you consistent charging power whether you are idling in traffic, crawling off‑road, or cruising the highway. Unlike competitors, it doesn’t need high engine speeds to deliver its rated performance.
 
Every alternator is 100 percent brand new and made in the USA, with no core charge required. You won’t find rewound or recycled parts here—only a purpose‑built unit designed to last, available in three distinctive non‑stock colors or in an OE‑style raw aluminum finish for those who prefer the factory look.
 
The benefits extend beyond reliability. For enthusiasts running high‑amperage car audio systems, off‑road lighting, winches, refrigerators, or multiple battery setups, this alternator provides the stable voltage and current needed to keep everything running without strain. It comes backed by a one‑year, no‑hassle warranty, giving you confidence that your investment is protected.
 
Upgrade Kit Adds:
High-Output Alternator:  220A
1/0 Cable:  Alternator ~ Battery
Fuse Holder:  1/0 input|output with 250A ANL fusible link 
 
 
The Ford Ranger was built for adventure, but modern accessories and upgrades can quickly overwhelm the stock alternator. This high‑output unit ensures your electrical system keeps pace, delivering stable voltage and reliable current under every condition. Whether you are outfitting your rig for overlanding, powering auxiliary gear on the trail, or simply wanting peace of mind for daily driving, this alternator provides the foundation your Ranger deserves.