The Boat Galley Store
12 Volt Wiring Size Chart
12 Volt Wiring Size Chart
SKU:TBG-12V
Easily Find the Right 12V DC Wire SizeAvoid the risks of improper wiring, such as equipment damage or fire hazards. The 12 Volt Wiring Size Chart is your trusted solution for selecting the correct wire size for any 12V DC project - whether on your boat,...
See full product details and specificationsCouldn't load pickup availability
- Ships in 1–5 business days
- 30-day returns
- Advice from real cruisers
Easily Find the Right 12V DC Wire Size
Avoid the risks of improper wiring, such as equipment damage or fire hazards. The 12 Volt Wiring Size Chart is your trusted solution for selecting the correct wire size for any 12V DC project - whether on your boat, in your car, or for your RV. With large, easy-to-read shaded charts for both 3% and 10% voltage drop, you can size wires accurately and efficiently every time.
- Includes detailed tables for both regular and engine-room installations
- Durable, waterproof, and grease-proof design stands up to tough environments
- Compact size, perfect for toolboxes, lockers, or workbenches
How to Use • Step-by-Step with Pictures
Includes More Than Just Wire Sizes
- Wiring connector sizes and color codes
- Battery state of charge chart
- Simple formulas for watts, amps, and volts
Made in USA • Built to Last • Environmentally Friendly
Designed in the USA; printed in the USA on American-made recyclable synthetic paper using environmentally-friendly soy-based inks at a facility that is completely wind-powered. Minimal packaging. Tough enough to handle life on a boat, it won’t tear, degrade, or smear, even in humid or greasy conditions.
Shipping & lead times
Shipping & lead times
We're a small team of boaters and we pack orders within 1–5 business days (no weekend or holiday packing). You'll get an email with tracking as soon as a label goes on your box.
Specialty items — fire extinguishers (dangerous goods) and low-stock or built-to-order gear — can take longer; the product description will say so. On a tight timeline or meeting your boat somewhere specific? Contact us and we’ll work out the fastest way to get gear to you.
International orders ship DDU: local duties, taxes, and customs fees are the buyer’s responsibility. Full details in our shipping policy.
Returns & refunds
Returns & refunds
30-day returns from the date of purchase. Items must be unused, in the original packaging with all cables and accessories, with proof of purchase.
Contact us before shipping anything back — we’ll send the return form that must accompany your return. Fire extinguisher and lithium battery items carry a $15 administrative fee on returns.
Read the full refund policy.
Ask a cruiser before you buy
Ask a cruiser before you buy
Everyone here is a current or past cruiser — we’ve docked short-handed, re-rigged at anchor, and chased 12V gremlins too. Not sure this is the right fit for your boat? Send us your question before you order and we’ll give you a straight answer.
Product details
Easily Find the Right 12V DC Wire Size
Avoid the risks of improper wiring, such as equipment damage or fire hazards. The 12 Volt Wiring Size Chart is your trusted solution for selecting the correct wire size for any 12V DC project - whether on your boat, in your car, or for your RV. With large, easy-to-read shaded charts for both 3% and 10% voltage drop, you can size wires accurately and efficiently every time.
- Includes detailed tables for both regular and engine-room installations
- Durable, waterproof, and grease-proof design stands up to tough environments
- Compact size, perfect for toolboxes, lockers, or workbenches
How to Use • Step-by-Step with Pictures
Includes More Than Just Wire Sizes
- Wiring connector sizes and color codes
- Battery state of charge chart
- Simple formulas for watts, amps, and volts
Made in USA • Built to Last • Environmentally Friendly
Designed in the USA; printed in the USA on American-made recyclable synthetic paper using environmentally-friendly soy-based inks at a facility that is completely wind-powered. Minimal packaging. Tough enough to handle life on a boat, it won’t tear, degrade, or smear, even in humid or greasy conditions.