Dan Sullivan is a professional vehicle electrician and electrical trainer, member of TMC and the founder of Sullivan Training Systems - the only technician-owned training company dedicated solely to electrical training specifically for mechanics in the heavy equipment and heavy truck industries. He has more than 25 years experience as a mechanic and 20 years as a technical teacher. Since 1996, he has taught his streamlined diagnostic methods to more than 4,000 technicians employed by every major U.S. and European truck manufacturer. He is the author of Fundamental Electrical Troubleshooting, a 200-page practical electrical shopbook, and is the inventor of TESlite Voltmeter Leads - a tool that allows an instantaneous load test of wiring to locate corrosion with a digital voltmeter.