Electrical Maintenance Handbook,". by. Dan Masters. 182 pages, hundreds of photos,. diagrams, etc. Soft cover. ELECTRICAL SYSTEM—TERMINAL BLOCK, TR6. Even if you don't have a TR250 or TR6, this book provides a worthwhile education. Electrical Maintenance Handbook. by Dan Masters. c-e-s.demon.co.uk Electrical TR250/6 Maintenance Handbook Written by Dan Masters and available from DMP, PO Box 6430, Maryville, TN 37802-6430, USA. By Dan Masters dmp. AUTO-WIRE No part of this manual may be reproduced in any form, Gauges:The wiring diagram shows connections for the original. Is Dan Masters still selling his TR6 guide for the electrical system? Carl Feickert Triumph TR 250 - TR6 Electrical Maintenance Handbook: Super manual. Some critiques: the wiring diagrams are too small to adequately read. I would suggest Dan Masters' TR6 electrical book and there's a downloadWe all know the electrical systems can pose some special problems, this manual really spells things out in a Dan Masters TR250 - TR6 Electrical Handbook.