I finally took some time, while camping in the California desert this
winter, to read up a little about how to work with electricity in vehicles,
etc.  A friend lent me this small book referenced below and I found it just
right for an electrical dummy like me who doesn't really want to know
everything in the world about it, but who has cause to try to keep vehicles
and their sub-systems  functional.  With just a few hours and some study, I
learned enough to help myself accomplish things I would never have know how
to even begin.  I will go back and re-read this small concise text again
soon to gain further knowledge..

http://www.amazon.com/Managing-12-Volts-Troubleshoot-Electrical/dp/0964738619

  Don Hanson