Just sat and read this whole thread, and thought, this is what I just went through. Turned out to be a wire to the resistor right behind the drivers headlight was corroded and had a bad connection. Found out about this from another recent thread about A/C pressures causing the fans to come on. The fans on the 400E were running a LOT on high speed which they never seemed to do before, and the temps were routinely going over 100. Check that resistor.
Here is that thread.
http://www.peachparts.com/shopforum/showthread.php?t=193757