Headlight switch , is it the cause? or the curse?

Thanks for all that info. This is great stuff. I have a multimeter, but I do not have the 12v lamp tester. Will get it today. There is corrosion at the bulkhead terminals for the headlight section ,. I sprayed some DeOxit, but no change. On the headlight switch there is a small rust spot at the revit near the B1, which has spread to the terminal as well. Though I just checked continuity across all the terminals, and they are all working strong. So I begin to suspect the dimmer switch? I also need to work on the bulkhead. No idea where I am going to locate a new plastic plug, but maybe I could squeeze some liquid rubber in there to at least stop any arcing that might occur. I also broke one of the terminals which needle nose pliers, so I have to replace that no matter. It was corroded as well. Keep it coming.

Read this article. It points out the major causes and troubles with the bulkhead connector. You can get replacment terminals, they are known as "Packard 56." I got some here

http://www.clipsandfasteners.com/Packard_56_Series_Male_18_Gauge_Terminals_GM_29654_p/w30c030.htm

You have to be very careful when you order females and get the ones that look EXACTLY like yours. There is a slightly different "GM" type that will not fit the connectors

Mad article:

http://www.madelectrical.com/electricaltech/amp-gauges.shtml

As Ron, "Crackedback" suggested, putting relays in the system gets rid of dim headlights, and relieves the electrical strain on several points in the system. I'd get them working, tho, first.