Tom S. from Anchorage posted this site on one of our threads. It's one of the best teaching sites I've seen on electrical components, such as relays,diodes, wiring. Mostly and audio site but well worth a look-see.Has hundreds of diagrams, and 50+ interactive calculators, a large directory,and over 100 webpages
Rich
http://www.bcae1.com
Dang, Rich, there is a lot of stuff there. I only posted the link to the relay info, that's all I had seen. I'd never used these before so looked it up when I needed to learn something about what I needed to get for relays to add something to one of my motorcycles.
Here is a link to my post with pix of their operation & the link to just the relay stuff.
http://57fordsforever.com/smf/index.php?topic=2247.msg20944#msg20944
The little relay I got at an electronics store & the pre-wired plug that I should have got in the first place. 5 bucks each. Gives an idea about their size.