Knowledge Centre

Welcome to our Knowledge Centre!

This area of our site is devoted to unravelling the sometimes mysterious world of auto and marine electrics by providing you with some useful guides and resources to help you in your wiring projects. We're adding information all the time so please check back regularly to see what's new.


12 Volt Frequently Asked Questions (FAQs)

In this section are answers to many of the commonly asked technical questions related to 12 volt wiring. Use this as a quick reference to save you time when deciding what parts to select for your project..........Read more


Electrical Circuit Basics

Electricity is a fundamental part of the workings of most vehicles and this section aims to explain the basic principles. Hopefully this will give you an understanding and allow you to carry out some simple calculations for specifying the electrics in your auto or marine wiring projects.........Read more

Cable Sizing & Selection

One of the most important aspects of any wiring project is determining the correct size and type of cable to use for each circuit. Too small a cable size and you'll run the risk of generating heat in the cable; too large and you'll be wasting money on copper you don't need......Read more

Fusing Guide

Fuses are critical in any electrical system and are used to protect a circuit from excessive current that could lead to damage and, very often, an electrical fire. Excessive current is most likely to be caused by three things........Read more


Relay Guide

Relays are used extensively throughout all modern vehicle electrical systems. They are quite simple devices but very useful, so once you understand how they work and what they enable you to do it opens up a vast range of applications for your aftermarket projects.......Read more

Split Charging Guide

If you own a motorhome, campervan or boat then you'll probably need a 2nd battery to run all of your leisure electrics such as lights, coolbox/fridge, TV, navigation equipment, power sockets etc. In order to keep this 2nd battery charged you'll need to connect it to a power source such as your engine's alternator or a mains battery charger. This is what split charging is all about.......Read more

Auxiliary Battery Charging In Vehicles With 'Smart' Alternators

One of the emissions-reducing technologies that is now becoming standard on new vehicles, is  the 'smart' or 'intelligent' ECU-controlled alternator. Unfortunately traditional split charging systems using VSRs are not compatible with smart alternators so a battery-to-battery charger must be used instead.......Read more

LED Lighting Brightness Guide

Conventional lighting based upon incandescent filament bulbs is traditionally referred to as having an output in Watts. This allows us to have a good understanding of how bright it will be as there is an approximate correlation between power consumed by the bulb (Watts) and brightness.  The problem with LEDs is that they use much, much less power than conventional bulbs for an equivalent light output, so using Watts as a measure of comparing brightness is no longer useful.......Read more


Latest news: 
Friday, 19 August 2016  |  Admin
Get Connected - New products for Aug 2016

We're now stocking the Blue Sea Systems range of weatherproof plugs, sockets and accessories designed specifically for use in harsh marine environments, as well as their new OLED voltmeter and twin fast charge 4.8A USB socket.

Friday, 15 July 2016  |  Admin
Lighting The Way - New products for July 2016

This month we've added some of the best new LED lighting designs to our range to bring you even more choice when fitting out your boat or vehicle.

Wednesday, 27 April 2016  |  Admin
New products for April 2016 UK-made switch panels

This month we're continuing to expand our range of high quality products from marine electrical experts, Blue Sea Systems, and are pleased to introduce a range of UK-made switch panels for those wanting an integrated solution to circuit switching and protection.

Friday, 8 January 2016  |  Admin
New products for Jan 2016

This month we're focusing on our new range of chargers and inverters from Sterling Power Products. Sterling's battery-to-battery chargers will be of particular interest to those of you wishing to charge a secondary battery in a vehicle with a 'smart' alternator, where a traditional VSR won't work properly.

Wednesday, 21 October 2015  |  Admin
New products for Oct 2015

An extended range of Anderson Power Product's industry leading connectors hits our warehouse shelves this month, plus a 10-way waterproof fuse box for those tough environments. We are also now stocking a range of adaptors to interface Superseal connectors with convoluted sleeving, providing your wiring harnesses with better protection and a professional finish.

Wednesday, 30 September 2015  |  Admin
New products for Sep 2015

Our LED lighting range has had a further expansion this month with a range of waterproof scene, awning and strip lights from UK company Labcraft. We can also now offer a terminal crimping tool that is dedicated for use with heat shrink terminals and prevents damage.

Friday, 19 June 2015  |  Admin
New products for June 2015

We've some exciting new additions to our product range this month with a full selection of adhesive-lined heat shrink crimp terminals for those really demanding environments, plus dual power posts for extend high current cables. We also have a touch-sensitive, waterproof LED light and covers for our fused battery terminal clamps.

Friday, 28 November 2014  |  Admin
New products for November 2014

November has seen us busy sourcing a variety of new products to stack on our shelves in the run-up to Christmas, including fused battery clamps, LED hand lamps, Victron battery monitors and rectangular interior lamps from LED Autolamps. 

Tuesday, 28 October 2014  |  Admin
New products for October 2014

This month's additions include an expansion to our range of workshop assortment kits, a 3-output 30A Blue Power charger from Victron Energy, white-sheathed tinned marine cable from OceanFlex and LED step lights from LED Autolamps.

Thursday, 2 October 2014  |  Admin
Slimline, Low-Cost LED Work Lamps Now In Stock - 10-30V

We've recently added some slim-line, low cost, LED work lamps to our range which are ideal for general task lighting or for fitting to bumpers or grilles as driving lights.




The information contained in our Knowledge Centre is provided in good faith and we do our best to ensure that it is accurate and up to date. However, we cannot be held responsible for any damage or loss arising from the use or mis-use of this information or from any errors contained herein. If you are in any doubt please consult a qualified auto or marine electrician.