Start by getting the heavy current drawn by the headlights, driving lights and landing lights out of the dash. The easiest way is to use those circuits to trigger Bosch relays that are connected directly to battery power. The 40Amp Bosch or Bosch type relays can be obtained at Radio Shack or most automotive supply stores.
I bought mine from Digikey (www.digikey.com) and also bought the sockets for them with the wires already attached. The relays are regular VF4 automotive relays used in many cars and trucks. The Digikey Part # is: PB149ND.
If you use these relays you will be pulling very little current through your dash since the dimmer switch now triggers the relay and the headlights and driving lights are now getting full battery power.  With this mod you get really BRIGHT lights, especially if you have halogens.
When I go back into the dash this fall for a little more work (I have already replaced bad molex connectors for the correct series, gauges and many wires, I plan to also change to a more flexible wire so that everything fits better under the dash.

By the way if you are going to do any work on your dash, I would suggest buying the correct tools to work on the molex connectors, a pin extractor, pin crimpers, etc. Makes it really easy to work on them. All of these items can be bought from Digikey.

tom
82 FC35