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I seem to have had an increase over the last few weeks of emails from people involved in building, modifying or upgrading Overland Expedition type vehicles. I think some of my posts must have been quoted or referenced in related forums. A lot of questions are related to roughly the same group of topics so I thought I’d produce three drawings to help answer the bulk of the questions. If you read down the comments on some posts I have answered a lot of specifics that might help.  I’ve merged a lot of the questions into a paraphrased ones…

Question 1

“How can I get my LED light bar and spotlights to come on when I use my main beam switch but I want to disable them when on the highway?”

Auto Switch Driving Lights

Link to A3 PDF – Auto Switch Driving Lights

The questions were from a number of 4 x 4 Off Road enthusiasts and Overland vehicle people. Simplest way I could come up with was using a couple of diodes (details on the drawing) Three switches… one for LED Light Bar, One for Driving Lights and one that allows you to sync the LED Light Bar and Driving Lights to the operation of the main beam in the vehicle. Flash the main beam and with the Sink Switch ON… all the lights will flash. Note… this may be illegal in some countries, so having the option to turn off the facility when on the roads ‘should’ keep you within the law…. don’t quote me on it!!!

Question 2

“Whats the best layout for connecting a solar controller / inverter / isolation switch to my battery bank?”

Overlander Wiring Diagram - 01

Link to A3 PDF – Overlander Wiring Diagram – 01

The best schematic I could come up with that is flexible for most situations. I’ve put a few notes on the drawing. The various components I’ve drawn generically…. all can be found at your preferred supplier.

Question 3

“What’s the basic layout of the vehicle fridge and leisure battery charing circuit?

Basic 13 Pin Power Loom 1

Link to A3 PDF – Basic 13 Pin Power Loom 1

This I think has come from a few on-line discussions relating to poor performance of the fridge and leisure battery charing in older 4 x 4 vehicles. I was receiving for a while a number of questions related to upgrading older installations. I also receive a number of emails asking how to add the facility of fridge and leisure battery charging to older vehicles and upgrade the 7 pin tow socket or old military lights socket.

You can download the PDF’s and are free to use for personal use. If you post them on other forums I’d appreciate a link back to this page and/or an acknowledgement.

I’d appreciate any feed back in the comments below.