KIT20 Marine Accessory Kit: What's Included and Who It's For
By BOSS Audio Systems | Life at Full Volume | Published: 2026-10-31
Category: Buying Guides
A practical buying guide to the KIT20 marine accessory kit: what the 0-gauge wiring package includes, who it suits, and when a different kit makes more sense.
Quick answer
Buy the KIT20 if you are wiring a single high-current marine amplifier and want the heavy 0-gauge power and ground cables, fuse holder, turn-on wire, speaker wire, RCA interconnect, and finishing hardware in one package. Skip it if your amplifier accepts only 4- or 8-gauge wire or you are replacing one short cable.
Why 0-gauge changes the install plan
The KIT20 is built around 0-gauge power and ground cable, which is much thicker than the 4- or 8-gauge wire used in many small amp installs. That thickness is the main reason to choose this kit, and also the main reason to check your amplifier's power terminals before buying. If the terminal block will not accept 0-gauge cable, you will need a reducer or a different kit.
Thick cable also needs more room to route. Plan a path from the battery to the amplifier location that can handle the bend radius of 0-gauge wire, and leave enough slack at both ends to make clean terminations.
What the included hardware tells you about the job
The kit supplies a nickel-plated 200A ANL fuse and a matching ANL fuse holder, so the main power protection is part of the package. The 200A rating is a fixed value, not a menu: confirm that it is appropriate for your amplifier's current draw and the cable run before you install it. If your amplifier calls for a different fuse rating, plan to source that fuse separately.
The kit also includes gold-plated spade and ring terminals, split loom tubing, and wire ties. Those are the small parts that often turn a one-trip install into three trips, so having them in the box is a real convenience. The RCA interconnect and speaker wire are included as well, which means the kit covers signal and output wiring in addition to power.
Where the KIT20 is a poor fit
This is a single-amplifier package. If you are running multiple amps, a distribution block and additional cable runs are not included, and you should not assume the kit scales to that layout. Likewise, if you are only replacing a short ground cable or adding a second battery, buying a full 0-gauge kit is more wire and hardware than the job needs.
Lengths are fixed. The 17 ft. power cable and 3 ft. ground cable suit many boat layouts, but long runs from a battery compartment to a helm or console may need more cable than the kit provides. Measure your route before ordering rather than assuming the included lengths will reach.
Decision rules for choosing the KIT20
- Check amplifier terminal size first: If your amplifier's power and ground terminals accept 0-gauge cable, the KIT20 is a candidate. If they accept only 4- or 8-gauge, choose a smaller-gauge kit or plan for reducers. Terminal size is the first yes-or-no check, not the price.
- Confirm the fuse rating: The included ANL fuse is 200A. Match that against your amplifier's recommended fuse rating and your cable length. If they differ, budget for the correct fuse. Never install a fuse just because it came in the box.
- Measure the cable route: The kit provides 17 ft. of power cable and 3 ft. of ground cable. Measure from the battery to the amplifier and from the amplifier to a clean ground point. If either run is longer, source additional cable. A kit that does not reach is not a saving.
- Count your amplifiers: The KIT20 is laid out for one amplifier. For two or more amps, plan a distribution block and extra cable runs, or choose a multi-amp wiring solution. One amp, one kit is the safe assumption.
- Decide whether you need the whole package: If you already have RCA cables, speaker wire, and terminals, you may be paying for duplicates. If you are starting from scratch, the bundled parts save separate orders. Inventory what you own before buying a full kit.
Product facts
- KIT20: Includes 17 ft. 0-gauge matte red power cable and 3 ft. 0-gauge matte black ground cable. The heavy-gauge copper is the core of the kit, so check that your amp accepts 0-gauge and that 17 ft. reaches your mounting location.
KIT20 - KIT20: Ships with a nickel-plated 200A ANL fuse and ANL fuse holder. Main power protection is included, but the 200A rating is fixed, so verify it matches your amplifier's requirements.
- KIT20: Also contains 18 ft. 18-gauge blue turn-on wire, 17 ft. 16-gauge speaker wire, and a 17 ft. RCA interconnect. Signal and output wiring are covered in the same box, reducing the number of separate parts you need to order.
- KIT20: Includes 6 ft. split loom tubing, ten 6-inch black wire ties, and gold-plated spade and ring terminals. Finishing hardware for a tidy, protected run is included, which matters on a boat where vibration and moisture are constant.
Who should buy the KIT20
Best for
- Boat owners installing a single high-current marine amplifier that accepts 0-gauge power wire
- First-time installers who want power, ground, turn-on, speaker, and RCA wiring plus terminals and loom in one purchase
- Installs where the battery-to-amplifier run is about 17 ft. or less and the ground run is about 3 ft. or less
Not for
- Amplifiers with 4- or 8-gauge power terminals
- Multi-amplifier systems that need a distribution block and additional cable
- Buyers who only need a replacement cable or a fuse and already own the rest of the hardware
