This pdf file is compiled by Vertical Power Systems to assist builders in installing their electrical system fault and trouble free. It describes top ten mistakes people make.
Make sure you also read the 100% fool proof gonna work aircraft wiring by Greg Richter (former blue mountain avionics) here.
Excerpt from the document:
Over the last several years we have helped hundreds of builders plan, install and troubleshoot the electrical system on their aircraft. Through all of that, we have found there are several common mistakes that people make – it's only natural as people venture into new areas. This document is written to help you avoid those mistakes. These pointers apply equally to traditional wiring as well as aircraft wired using the Vertical Power system
To continue reading see the pdf below: