BEST CONNECTIONS 14 Gauge Automotive Primary Wire (100ft Each – 7 Color Bundle Set)– Durable Primary/Remote, Power/Ground Electrical Wire for Trailer, Car Audio, Lighting Circuits – 700ft Total

A tidy wiring job starts well before the first crimp; it starts with having the right wire on the bench. I picked up the 14-gauge seven-color bundle from BEST CONNECTIONS for a round of trailer repairs and some interior automotive add-ons, and after working through a few projects with it, I have a clear sense of where it shines—and where I’d reach for something else.

What’s in the bundle

You get seven 100-foot rolls of 14 AWG primary wire, each in a different color, for a total of 700 feet. The conductors are copper-clad aluminum (CCA) with a PVC jacket. It’s aimed squarely at low-voltage DC tasks—vehicle accessories, trailer lighting, remote turn-on leads, power/ground for modest loads, and general 12–24 V circuits (the manufacturer lists 6–80 V applications). The variety of colors is the standout feature right away; being able to map functions to colors and keep that mapping consistent across a vehicle or trailer is a real productivity boost and pays dividends during future troubleshooting.

Build and materials

CCA is the defining design choice here. The copper cladding makes the surface behave like copper for soldering and termination, while the aluminum core keeps cost and weight down. That’s perfectly fine for many automotive circuits, but it’s not a one-to-one substitute for oxygen-free copper (OFC). CCA has higher resistance than the same gauge in full copper, so planning for voltage drop and current capacity is part of the deal. In practical terms, I treat this 14 AWG CCA as closer to 15–16 AWG copper for conservative current planning. For modest loads and short runs, it’s a non-issue; for higher draw or longer runs, it’s worth calculating drop or stepping up a gauge.

The jacket is a standard PVC primary insulation. It strikes a nice balance between protection and flexibility. The insulation walls are on the slightly thicker side for automotive primary, which is helpful when the wire is dragged through a frame channel or along a trailer rail. It’s not as abrasion-resistant or high-temp rated as cross-linked insulation (TXL/GXL), but for general routing with loom and grommets, it’s well suited.

Stranding is fairly fine for a CCA product and the conductors don’t splay or break when stripped with a properly sized tool. I tried both manual strippers and a self-adjusting style; both produced clean strips without nicking. The copper cladding takes solder readily, and adhesive-lined heat shrink bonds nicely to the PVC.

Installation experience

I used this bundle to rewire a small utility trailer with LED lighting and to add a handful of accessories to a daily driver (dash cam, a couple of relays, and a small inverter feed for a rear cargo outlet). Having seven colors on the bench let me color-code functions in a way that mirrored common trailer conventions: brown for running lights, yellow for left turn, green for right turn, white for ground, etc., and still reserve red/blue for power and relay triggers inside the vehicle. That alone reduced label writing and made continuity checks straightforward.

The wire feeds smoothly off the small spools and doesn’t hold a tight memory curl. Even in a cold garage, the jacket stayed pliable enough to route through loom and around tight corners without fighting me. Where the path passed through sheet metal, I used rubber grommets; with the slightly thicker PVC, the fit felt secure and scuff-resistant. Crimp terminations (insulated butt splices and ring terminals) grabbed the conductor firmly; a quick tug test and continuity check showed solid connections. On the trailer, I finished branches with adhesive heat shrink, and the jacket didn’t shrink or distort excessively under the heat gun.

Electrical performance

In the use cases I care about—LED markers and brake/turn lights, relay triggers, and general accessory wiring—the wire behaved exactly as I’d expect. No erratic voltage drops, no warm runs under load, and resistance readings were consistent across lengths. For the accessory inverter feed (a modest 10 A fused line), I kept the run short, and routing was clean; even so, that’s about the upper edge of where I’d routinely use CCA at 14 AWG without bumping to a thicker conductor. For speaker runs or a remote turn-on lead in an audio install, this gauge and material are more than adequate over typical interior distances.

As always with CCA, the caveat is current and distance. If you plan to run a high-draw accessory the length of a vehicle or out to a trailer’s tail, consider stepping up a gauge (or two) or using copper for that specific run. It’s not that this wire can’t handle it; it’s that keeping voltage drop low is easier with copper or larger CCA.

Durability and environment

PVC primary wire thrives in protected environments and light-to-moderate exposure. I routed the trailer runs inside split loom and secured them at regular intervals with zip ties and P-clips. The jacket stands up well to incidental abrasion and the occasional brush against a frame edge. I would not run this directly in an engine bay near exhaust components; for those areas, I prefer GXL/TXL with higher temperature ratings and better chemical resistance. For marine or salty environments, I’d also switch to tinned copper, as CCA isn’t the right long-term choice for harsh corrosion scenarios.

That said, for a utility trailer that sees rain, gravel, and road grime, the PVC jacket—protected by loom—has been unfazed so far. It cleans up easily and doesn’t get brittle. The flexibility remains good in colder weather, which makes connector service down the line less annoying.

Organization and color management

Seven distinct colors across seven spools is the unsung hero of this bundle. It allowed me to keep signal types consistent across projects, which makes diagnostics far less painful later. My simple approach:
- Reserve white and black for grounds.
- Use brown/yellow/green for trailer lighting circuits according to convention.
- Keep red/blue for switched power and relay triggers.
- Document the mapping on a piece of masking tape inside the junction box.

With 100 feet per color, I didn’t find myself rationing wire midsession. For most DIYers and even pros doing periodic builds, that length is a sweet spot—plenty for multiple projects without a giant, awkward master spool taking up shelf space.

Limitations and what it’s not

• It’s CCA, not full copper. Plan your runs accordingly, especially for higher draw accessories or long distances.
• The insulation is PVC, not cross-linked. Keep it away from high-heat zones and use loom and grommets anywhere there’s potential rubbing or sharp edges.
• It’s not marine-grade. If you’re wiring a boat or trailer that lives on the coast, go tinned copper.

None of these are faults so much as boundaries. When used inside those boundaries, the wire performs exactly as intended.

Value

This bundle lands in a very good price-to-utility spot. For the cost of a couple of individual copper spools, you get seven colors, each at 100 feet. If your work regularly involves low-voltage DC circuits that aren’t pushing the envelope on current, it’s a sensible purchase. I like that I can keep the set on a small rack and pull exactly what I need without juggling half-used odds and ends from different brands.

Practical tips for best results

• Size for the job: if in doubt, go up a gauge or shorten the run to keep voltage drop in check with CCA.
• Protect the run: use split loom, rubber grommets, and abrasion guards. PVC does fine when it isn’t chafing.
• Terminations matter: quality crimps with the correct die, plus adhesive-lined heat shrink, go a long way.
• Label once, save time forever: color-code consistently and note it in the fuse box or junction enclosure.

Recommendation

I recommend this 14-gauge seven-color bundle to anyone wiring trailers, adding automotive accessories, or building low-to-moderate current DC circuits where color organization and flexibility matter. It’s easy to work with, solders and crimps cleanly, holds up well when properly protected, and the seven-color format streamlines both installation and future troubleshooting. For high-current, long-run, engine-bay, or marine work, choose a higher-temp copper alternative. But for the bulk of everyday 12–24 V projects, this bundle is a practical, cost-effective staple I’m glad to keep on the shelf.